Coach — partners on lorry cut inside it (8)

I believe the answer is:

instruct

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

I can't explain the rest of the clue.

(Other definitions for instruct that I've seen before include "Impart skills or knowledge to" , "Direct, command" , "Give lesson or order to" , "Command; teach" , "Teach or give orders to" .)

I've seen this clue in The Guardian.

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