Group in Punjab banned (4)
I believe the answer is:
abba
'group' is the definition.
'in punjab banned' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ABBA' can be found hidden inside 'punjab banned'.
(Other definitions for abba that I've seen before include "1970s Swedish pop group" , "Renowned Swedish foursome" , "Pater's" , "Eurovision prizewinning Swedish pop group" , "rhyme scheme" .)