Perhaps corner rook or knight? (3,5)

I believe the answer is:

set piece

I believe this clue is a double definition.

'perhaps corner' is the first definition.
(corner is a type of set piece in football)

'rook or knight?' is the second definition.
(pieces in a chess set)

(Other definitions for set piece that I've seen before include "Standard manoeuvre" , "Carefully planned manoeuvre" , "A rehearsed, impressive, manoeuvre" , "corner, say" , "oft-rehearsed play" .)

I've seen this clue in The Telegraph.

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