Possibly a drag for an Irish police officer (5)
I believe the answer is:
garda
'irish police officer' is the definition.
(I've seen this before)
'possibly a drag for an' is the wordplay.
'possibly' indicates an anagram.
'for' means one lot of letters go next to another.
'an' becomes 'a'.
'drag' anagrammed gives 'gard'.
'gard'+'a'='GARDA'
(Other definitions for garda that I've seen before include "Irish police officer" , "Irish state police force" , "Cop" , "Italian lake - Irish police" , "Italian lake - Irish policeman" .)