Sandman it is
SANDMAN
+++++
Julie wanders about. (7)
ANDREWS (anagram)
Lead lance command. (9)
Thais is a stretch but I’m going to guess STRONGARM as a double definition:
You need a strong arm to be the best (lead) lance wielder; to strongarm someone is to give them a command.
I am thinking SPEARHEAD (Spear + head)
Correct.
SPEARHEAD
+++++
Promised war fund contribution is a small one. (5)
DWARF (promiseD WAR Fund)
Afraid? Confused I lack the capacitance. (5)
FARAD (afraid without I, anagram)
+++++
This god fellow is a real gas (5)
Radon (Ra + Don)
+++++
That the National Institute of Health is literally in such muddle is first order nonsense! (8)
Took me a bit, but NIHILISM (first letters of NIH and the words following that in the clue) - good one.
+++++
Give me a minute mixing with gross broad, spread (11)
Give me a minute mixing with gross broad, spread (11)
SMORGASBORD (gross broad* + m)
+++++
Brothel’s broken doorbell. (8)
Quick work, Biotop! Have you seen that anagram before?
BORDELLO (nice anagram of doorbell, new to me)
+++++
Double-O’s get-out clause (8)
Double-O’s get-out clause (8)
LOOPHOLE (LOOP + HOLE are two O’s.) Nice!
++++++
Scary Halloween Pat Gibson movie. (6, 6)
Lethal Weapon (anagram)
+++++
Adam plays with ropes and lassos on Nevada ranch (9)
That one was really well-crafted. I looked up “Pat Gibson,” saw he’s a quiz winner, and tried to think of a movie about quizzes. I overlooked the “scary=anagram of the next word or words” part and didn’t even consider Mel Gibson.
PONDEROSA (ropes and + o)
A saw, a cage, releases Lewis & Clark guide. (9)
SACAGAWEA (anagram of A SAW A CAGE)
'Pon my word, all this hidden artillery has made me weary. (8)
Sacagawea (anagram)
+++++
I emptied the well and then with ease threw in that treacherous traitor (6)
WEAPONRY (“pon” in the middle of “weary”)
WEASEL (inserting ease into the first and last letters of “well”)
Interesting that both clues used a similar idea!
Now then, an opportunity has presented itself here, let’s see if I can make it work… OK, a simple attempt:
+++++
Sails both ways (5)