Singular thing to shoot in a canoe (5)

I believe the answer is:

rapid

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

'shoot in a canoe' is the definition.
'rapid' can be an answer for 'shoot' (thesaurus). I am not sure about the 'in a canoe' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for rapid that I've seen before include "Expeditious" , "Precipitate" , "Happening at great speed" , "Electrical connector" , "Zippy" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app