Crossword Genius

Split when the vehicle overturns (4)

Ross

I believe the answer is:

part

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

'split when' is the definition.
'part' can be an answer for 'split' (synonyms). I am unsure of the 'when' bit.

'vehicle overturns' is the wordplay.
'vehicle' becomes 'trap' (trap is a kind of vehicle).
'overturns' says the letters should be written in reverse.
'trap' back-to-front is 'PART'.

'the' is the link.

Can you help me to learn more?

(Other definitions for part that I've seen before include "unemployed actor hopes for" , "Portion of a whole" , "Constituent - something to play?" , "Sever; portion" , "Fraction of the whole - separate" .)

I've seen this clue in the Evening Standard.
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