Find Barb cheerful (3,2)
I believe the answer is:
dig up
'find' is the definition.
(thesaurus)
'barb cheerful' is the wordplay.
'barb' becomes 'dig' ('dig' can be a synonym of 'barb').
'cheerful' becomes 'up' (I've seen this in other clues).
'dig'+'up'='DIG UP'
(Other definitions for dig up that I've seen before include "Find" , "Uncover (something hidden)" , "Excavate - discover" , "Exhume" , "Unearth" .)