Crossword Genius

Play group with an active use for a carthorse (9)

Ross

I believe the answer is:

orchestra

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

'play group' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'an active use for a carthorse' is the wordplay.
'carthorse' can be anagrammed to 'ORCHESTRA'.
But, I'm not clear how this is indicated.

'with' acts as a link.

Can you help me to learn more?

(Other definitions for orchestra that I've seen before include "players in pit" , "Big band" , "Other cars (anag.)" , "Gamelan, for instance" , "Instrumental group" .)

I've seen this clue in the Evening Standard.
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