Crossword Genius

Horse trading clique? (3)

Ross

I believe the answer is:

set

I'm a little stuck... Click here to teach me more about this clue!

'clique?' is the definition.
(a clique is a social set)

'horse trading' is the wordplay.
'SET' is hidden within the letters.
However, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for set that I've seen before include "several games" , "Scenery etc. for a drama" , "Arrange; a party" , "Complete collection" , "decline" .)

I've seen this clue in the Evening Standard.
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