Threesome not entirely patriotic (4)

I believe the answer is:

trio

'threesome' is the definition.
(both can mean a group of three)

'not entirely patriotic' is the wordplay.
'not entirely' indicates a hidden word.
'TRIO' can be found hidden inside 'patriotic'.

(Other definitions for trio that I've seen before include "Piece for three players" , "Musical group" , "Work for three" , "Archduke, possibly" , "Beethoven's 'Archduke': famous piece written for this ensemble" .)

I've seen this clue in The Times.

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