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Something like a football pitch (6)

Ross

I believe the answer is:

oblong

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'pitch' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I can't explain the rest of the clue.

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(Other definitions for oblong that I've seen before include "Oval" , "Figure with opposite sides parallel, longer in one direction" , "Rectangle with adjacent sides unequal" , "Cab" , "book form?" .)

I've seen this clue in the Evening Standard.
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