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Some Seventies girl I observe back in platforms (3,4)

Ross

I believe the answer is:

oil-rigs

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'platforms' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'some seventies girl i observe back' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'back' is a reversal indicator.
'sgirlio' can be found hidden inside 'seventies girl i observe'.
'sgirlio' backwards is 'OIL-RIGS'.

'in' acts as a link.

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I've seen this clue in The Telegraph.
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