Supplied sarcastic remark in deep confusion (8)
I believe the answer is:
equipped
'supplied' is the definition.
(equipping is a kind of supplying)
'sarcastic remark in deep confusion' is the wordplay.
'sarcastic remark' becomes 'quip' (I've seen this before).
'in' means one lot of letters goes inside another.
'confusion' indicates anagramming the letters.
'deep' with letters rearranged gives 'eped'.
'quip' going inside 'eped' is 'EQUIPPED'.
(Other definitions for equipped that I've seen before include "Provided" , "Fitted out with whatever's necessary" , "Armed" , "Given kit" , "Fitted out with the right tools" .)