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Horse's young footballers (5)

Ross

I believe the answer is:

colts

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'footballers' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.

'horse's young' is the wordplay.
'horse' becomes 'colt' (I've seen this before).
'young' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'colt'+'s'='COLTS'

Can you help me to learn more?

(Other definitions for colts that I've seen before include "Young stallions" , "Young male horses" , "young players" .)

I've seen this clue in the Sydney Morning Herald.
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