Crossword Genius

Double trouble in lake with oil incurring fine (9)

Ross

I believe the answer is:

lookalike

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

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

'trouble in lake with oil incurring fine' is the wordplay.
I cannot quite see how this works, but
'lake' could be 'l' and 'l' is located in the answer.
'fine' could be 'ok' ('OK' can be a synonym of 'fine') and 'ok' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for lookalike that I've seen before include "twin?" , "Doppelganger" , "Double" , "Copy" .)

I've seen this clue in The Independent.
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