A premium (5)

I believe the answer is:

bonus

'a premium' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for bonus that I've seen before include "commission" , "Extra income" , "Additional wage" , "Extra money paid for good performance" , "Extra pay, perhaps at Christmas?" .)

I've seen this clue in the Evening Standard.

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