A jazzy little group (5)

I believe the answer is:

combo

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'group' is the definition.
(a combo can mean a musical group)

I don't understand how the rest of the clue works.

(Other definitions for combo that I've seen before include "Music group" , "Small jazz group" , "Small pop group" , "group of players" , "Small jazz or dance band" .)

I've seen this clue in the Evening Standard.

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