Crossword Genius

Crazy girl going cool over biker boyfriend? (3,4,6)


I believe the answer is:

off ones rocker

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

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

'girl going cool over biker boyfriend?' is the wordplay.
I cannot really understand how this works, but
'going' could be 'off' (I've seen this in other clues) and 'off' is found within the answer.
'over' could be 'on' (physically on top of) and 'on' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for off ones rocker that I've seen before include "Crazy, totally mad" , "How a seated person might fall" , "Insane" , "not favouring my dove, > like a fallen Ronnie C?" .)

I've seen this clue in The Telegraph.
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