Minor branch organised by prigs (5)

I believe the answer is:

sprig

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'minor' is the definition.
(thesaurus)

'branch organised by prigs' is the wordplay.
'prigs' can be anagrammed to 'SPRIG'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for sprig that I've seen before include "Small stem with leaves or flowers" , "Younger member of family" , "Stem or spray" , "Spray or twig" , "Small twig" .)

I've seen this clue in the Evening Standard.

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