Abhor money being used to purchase substance that might influence mood, for instance (7)
I believe the answer is:
hormone
'substance that might influence mood for instance' is the definition.
'hormone' can be an answer for 'substance' (hormone is a kind of substance). I am not sure about the remainder of the definition.
'abhor money being used to purchase' is the wordplay.
'HORMONE' is hidden within the letters.
However, I'm not sure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for hormone that I've seen before include "A body chemical" , "Bodily activity regulator" , "insulin perhaps" , "Internal secretion - moorhen (anag)" , "something stimulating" .)