Team in duet surprise (6)

I believe the answer is:

united

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'team' is the definition.
(name of many soccer teams)

'in duet surprise' is the wordplay.
'in duet' anagrams to 'UNITED'.
But, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for united that I've seen before include "Manchester City's local rivals" , "Various football teams" , "joined with others" , "See 14" , "Mark -, Russian-born US abstract painter" .)

I've seen this clue in The Mirror.

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