Team given extra exam (6-4)

I believe the answer is:

eleven-plus

'exam' is the definition.
(former exam in UK schools)

'team given extra' is the wordplay.
'team' becomes 'eleven' (I've seen this before).
'given' is a charade indicator (letters next to each other).
'extra' becomes 'plus' (I've seen this before).
'eleven'+'plus'='ELEVEN-PLUS'

(Another definition for eleven-plus that I've seen is " School exam".)

I've seen this clue in The Guardian.

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