11ac
In team playing left half, powerful winger (6)
Solution:
CASTLE
Mentioning this to deplore the perpetuation of the chess rook being called a castle, unfortunately validated by Chambers and Collins (among others probably). It's the definition in the above clue, based on its starting position on a corner square of the chess board. I doubt many players think of it as a winger, though it is indeed the second most powerful piece after the queen.
Comments on the Times Snitch blog echo my thoughts. Often the 'last one in'. You could, however, admire the setter's deception where 'winger' usually implies a bird.