Small group allowed to produce poem (7)

I believe the answer is:

triolet

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

'small group allowed' is the wordplay.
'small group' becomes 'trio' (I've seen this before**).
'allowed' becomes 'let' (I've seen this before).
'trio'+'let'='TRIOLET'

'to produce' acts as a link.

(Another definition for triolet that I've seen is " short poem".)

I've seen this clue in The Telegraph.

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