Take canal boat nearly all the way back (4)

I believe the answer is:

grab

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

'take' is the definition.
(I know that grab is a more specific form of the action take)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for grab that I've seen before include "Brag about seizure" , "Seize rudely" , "'Seize, snatch (4)'" , "Impress" , "Grasp roughly" .)

I've seen this clue in The Independent.

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