Crossword Genius

Vehicles not starting fights (5)

Ross

I believe the answer is:

rucks

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'fights' is the definition.
Although both the answer and definition are verbs in their -s form, I don't understand how one could define the other.

'vehicles not starting' is the wordplay.
'vehicles' becomes 'trucks' (truck is a kind of vehicle).
'not starting' means to remove the first letter.
'trucks' with its initial letter removed is 'RUCKS'.

Can you help me to learn more?

I've seen this clue in The Independent.
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