I’d forget about trash (3,3,2)
I believe the answer is:
get rid of
'trash' is the definition.
(I've seen this in another clue)
'i'd forget about' is the wordplay.
'about' indicates an anagram.
'id'+'forget'='idforget'
'idforget' anagrammed gives 'GET RID OF'.
(Other definitions for get rid of that I've seen before include "Shrug off" , "sack someone else?" , "Cause to go away or throw out" , "dump" .)