Cut up leaf to brew this amount? (9)
I believe the answer is:
teacupful
'amount?' is the definition.
(teacupful is a kind of amount)
'cut up leaf to brew' is the wordplay.
'to brew' indicates anagramming the letters.
'cut'+'up'+'leaf'='cutupleaf'
'cutupleaf' anagrammed gives 'TEACUPFUL'.
'this' is the link.
(Other definitions for teacupful that I've seen before include "Liquid measure used in cooking" , "Measure used in recipes" , "small volume" .)