Search about in, for polish (6)
I believe the answer is:
finish
'for polish' is the definition.
(as in polishing or finishing a surface)
'search about in' is the wordplay.
'search' becomes 'fish' (fishing is a kind of searching).
'about' is an insertion indicator.
'fish' enclosing 'in' is 'FINISH'.
(Other definitions for finish that I've seen before include "Perfect" , "Conclude, wind up" , "Put the final touches to" , "Patina" , "Conclude, stop" .)