Crossword Genius

Where we get crude lass turning up after cry for attention (3,3)

Ross

I believe the answer is:

oil rig

I'm a little stuck... Click here to teach me more about this clue!

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

'lass turning up after cry for attention' is the wordplay.
'lass' becomes 'girl' (lass can mean a young woman).
'turning up' says the letters should be written backwards.
'after' is a charade indicator (letters next to each other).
'cry for attention' becomes 'oi' (oi!).
'girl' backwards is 'lrig'.
'lrig' after 'oi' is 'OIL-RIG'.

Can you help me to learn more?

(Other definitions for oil rig that I've seen before include "source of offshore wealth" , "'Structure for drilling (3,3)'" , "It's used for drilling, at sea perhaps" , "N. Sea platform" , "platform in the main" .)

I've seen this clue in The Guardian.
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