On which to play if led astray? (5)

I believe the answer is:

field

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'on which to' is the definition.
I can't tell whether this definition defines the answer.

'play if led astray?' is the wordplay.
'play' indicates an anagram.
'astray?' indicates anagramming the letters (I've seen 'astray' mean this).
'if' with letters rearranged gives 'fi'.
'led' anagrammed gives 'eld'.
'fi'+'eld'='FIELD'

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(Other definitions for field that I've seen before include "Sphere (of activity)" , "The ... (John B Keane)" , "Branch of knowledge; meadow" , "Realm" , "See 20" .)

I've seen this clue in the Evening Standard.

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