One only fights in play (10)

I believe the answer is:

toysoldier

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'one only fights in play' is the definition.
I know nothing about this answer so I can't tell whether this works.

'one only fights in play' is the wordplay.
I cannot really understand how this works, but
'one' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
'play' could be 'die' (dying is a kind of playing) and 'die' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Irish News.

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