Crossword Genius

Sailor, stabbed, doubled over (10)

Ross

I believe the answer is:

jackknifed

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'doubled over' is the definition.
The answer and definition can be both to do with motion as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?

'sailor stabbed' is the wordplay.
'sailor' becomes 'jack' (informal term for a sailor).
'stabbed' becomes 'knifed' ('knife' can be a synonym of 'stab').
'jack'+'knifed'='JACKKNIFED'

Can you help me to learn more?

(Other definitions for jackknifed that I've seen before include "Doubled up" , "Accidentally folded (of a lorry)" .)

I've seen this clue in The Times.
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