Band that used to be someone's pawn? (5)
I believe the answer is:
queen
I believe this clue is a double definition.
'band' is the first definition.
(rock band)
'that used to be someone's pawn?' is the second definition.
(a chess pawn can become a queen)
(Other definitions for queen that I've seen before include "Rock group; royal personage" , "powerful man on board" , "Ruling lady" , "Female monarch" , "Tom's partner" .)