Shout to young woman climbing platform (3,3)

I believe the answer is:

oil rig

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'platform' is the definition.
(I've seen this before)

'shout to young woman climbing' is the wordplay.
'shout' becomes 'oi' (I can't explain this - if you can you should give a lot more credence to this answer).
'to young woman' becomes 'girl' (synonyms).
'climbing' is a reversal indicator (in a down clue, letters climb up).
'girl' reversed gives 'lrig'.
'oi'+'lrig'='OIL-RIG'

Can you help me to learn more?

(Other definitions for oil rig that I've seen before include "Drilling platform" , "I would do well" , "What may be boring" , "used by a bore" , "Drilling edifice" .)

I've seen this clue in The Independent.

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