Put together power ballad? (4)
I believe the answer is:
pair
'put together' is the definition.
(thesaurus)
'power ballad?' is the wordplay.
'power' becomes 'p'.
'ballad?' becomes 'air' (ballad is a type of song or air).
'p'+'air'='PAIR'
(Other definitions for pair that I've seen before include "Twins" , "flight of stairs" , "Couple - wed" , "Brace, couple" , "E.g. two aces; mate" .)