Going off, is rounding the bend (2,3,4)

I believe the answer is:

on the turn

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

'rounding the bend' is the wordplay.
'rounding' becomes 'on' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'bend' becomes 'turn' (synonyms).
'on'+'the'+'turn'='ON THE TURN'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for on the turn that I've seen before include "Going sour" , "change" .)

I've seen this clue in the Evening Standard.

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