Crossword Genius

Horse training 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 training' is the wordplay.
'SET' is hidden in amongst the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for set that I've seen before include "Scenery etc. for a drama" , "Put, coagulate" , "Fix; lay" , "Badger's burrow" , "number of games" .)

I've seen this clue in the Evening Standard.
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