"A" team in reserve (5)

I believe the answer is:

aside

'in reserve' is the definition.
(I've seen this before)

'a team' is the wordplay.
'team' becomes 'side' (I've seen this before).
'a'+'side'='ASIDE'

(Other definitions for aside that I've seen before include "Actors comment to his audience" , "Apart; incidental remark" , "Privately, apart" , "Actor's line directed solely to audience" , "Whispered comment" .)

I've seen this clue in The Times.

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