Rotate in order to find n (4,1,1-4)

I believe the answer is:

make a u-turn

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

'order to find n' is the definition.
I know nothing about this answer so I can't judge whether this works.

'rotate' is the wordplay.
I cannot quite see how this works, but
'rotate' could be 'turn' (I've seen this in another clue) and 'turn' is found within the answer.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

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