Minor bit of damage taking out first fodder supply (4)
I believe the answer is:
rack
'minor bit of damage' is the definition.
'rack' can be an answer for 'damage' (thesaurus). I'm not certain of the 'minor bit of' bit.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for rack that I've seen before include "Torture device that stretches" , "Rail for torture" , "Neck or rib of mutton" , "Support" , "Shelf; cudgel (brains)" .)