Kelly green (double meaning)
+++++
At the start of his act he urinated on stage. Reviews say it didn’t work. (7)
At the start of his act he urinated on stage. Reviews say it was thermodynamic disorder (7)
ENTROPY (pun: INTRO + PEE)
+++++
The Cockney mahout asked: “Is me pachyderm involved in a scammy MLM arrangement?” (7, 6)
The Cockney mahout asked: “Is me pachyderm involved in a scammy MLM arrangement?” (7, 6)
PYRAMID SCHEME (Is me pachyderm anagram)
+++++
Extra dry climate damaged famous green housing development. (7, 4)
(Just wanted to say this month’s Harper’s cryptic puzzle “Faces” is a beast! If you want to fritter away a half day give it a go. The feeling of triumph upon completion is well worth it!)
And let me know if you need a hint on this clue.
I’m all dead ends, so I could use a hint.
It’s a traditional cryptic clue that can be split into wordplay/definition or definition/wordplay with no extra or filler words. The answer is very common and well-known.
And more than one overlapping letter from previous clue.
Extra = E…
Emerald city (e + dry climate)
++++++
Unstable golden bear is very common, so I hear (7)
Modified slightly:
Unstable Golden Bears are very common, so I hear (7)
It’s a homophone/pun:
Unstable Golden Bears is the homophone/pun/word play part, which leads to a synonym for very common, a word that does not start with y.
Typical? (tip + U Cal)
My intent with the clue was “tippy + Cal”.
Nonetheless, correct!
OK, you’re learning how to deceive with “typical” clue indicators. I will not underestimate you in the future. 
Practice ancient art and leach my boil. (7)
ALCHEMY (anagram of “leach my”)
++++
The condiment detective couldn’t see the forest for the trees.(6)
never mind
MYOPIA (Mayo PI anagram)
Rocky Raccoon poet in musical performance. (5, 8)
PIANO CONCERTO (anagram of “raccoon poet in”)
++++
Ring fighter mocked order to capture the capital of Australia.(8)
TOREADOR (anagram)
+++++
Oi! No nitrate! That ought to let you know the rules! (11)