Animals tore its eye out (6)
OTTERS (“tore its -i” anagram)
++++++
Soak demonstrator (6)
Is it SQUIRT?
+++++
Who goes where triads are wibbly-wobbly? (6)
Not squirt…
Is it SQUIRT?
+++++
Who goes where triads are wibbly-wobbly? (6)
+++++
Not SQUIRT.
Though it plays equally well off of TARDIS (triads*). 
Ah.
SHOWER
+++++
When it comes to abominations of the night, there are few lower than this guy. (8)
Pretty sure the original clue was SHOWER.
+++++
The scarlet viking ate a rodent and became irrational.(7)
WEREWOLF (few lower*)
ERRATIC (Eric with rat in the middle)
Foul or loch water mixes and flows into rine - it’s a gas (8)
CHLORINE
+++++
Broken sensor in charge of detecting gangrenous tissue. (8)
Or fluorine (foul*) if you wanted to play off werewolf instead 
.
NECROSIS (sensor I C*)
Opera character soiled costume (6)
ISOLDE (anagram)
Mixed hail led to infamous barber. (7)
ISOLDE*
+++++
This festered nation should be hurled out the window. (14)
DELILAH (hail led*)
DEFENESTRATION (festered nation*)
Our hands mixed Assets Under Administration, racing to Central America (8 or 9)
(VERY nicely written)
HONDURAS (our hands*)
NICARAGUA (A, U, A, racing*)
Let’s see if we can splice these bad boys together, before it gets out of hand.
+++++
Lobster got a degree from community college; now he’s got an old-timey sextant. (9)
Astrolabe (lobster + AA)
+++++
Murder victim’s name sound familiar? (4)
ABEL (soundalike)
Ring a Ms. Summer for deadly plant. (10)
BELLADONNA
+++++
Al Capone’s foil (8)
Aluminum?
Yes, Al (chemical symbol) and a type of foil. Your puzzle Biotop.
ALUMINUM
+++++
Broken dish came from FDR’s charity. (5, 2, 5)
MARCH OF DIMES (anagram)
Is it wrong that my first thought was Meals On Wheels?
++++++
The English drunk was idle and hard to understand.(8)