Practically nothing received by charity ahead of time (6)
I believe the answer is:
almost
'practically' is the definition.
(thesaurus)
'nothing received by charity ahead of time' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'received by' is an insertion indicator.
'charity' becomes 'alms' (alms is a kind of charity).
'ahead of time' becomes 't' (I've seen this in other clues).
'o' placed inside 'alms' is 'almos'.
'almos'+'t'='ALMOST'
(Other definitions for almost that I've seen before include "Not totally" , "Slightly short of" , "As good as" , "Well-nigh" , "practically" .)