Support sportsfield's surroundings (11)

I believe the answer is:

backgrounds

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'support sportsfield's surroundings' is the definition.
I can't tell whether this definition defines the answer.

'support sportsfield's surroundings' is the wordplay.
'support' becomes 'back' (to back is to support or endorse).
'sportsfield's surroundings' becomes 'grounds' (I can't justify this - if you can you should give a lot more credence to this answer).
'back'+'grounds'='BACKGROUNDS'

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

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