Consented to take top off, resulting in desire (5)
I believe the answer is:
greed
'desire' is the definition.
(greed is a kind of desire)
'consented to take top off' is the wordplay.
'consented to' becomes 'agreed' (agreeing is a kind of consenting to).
'take top off' means to remove the first letter (I've seen 'taking top off' mean this).
'agreed' with its initial letter removed is 'GREED'.
'resulting in' acts as a link.
(Other definitions for greed that I've seen before include "Circuit" , "Voracity" , "Vice" , "Immoderate desire" , "sin" .)