Small craft that can go back and forth on the water? (5)

I believe the answer is:

kayak

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

'small craft' is the definition.
'kayak' can be an answer for 'craft' (kayak is a kind of craft). I am unsure of the 'small' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for kayak that I've seen before include "Small canoe used by Eskimo" , "Inuit craft" , "Inuit boat" , "Small canoe with a light frame" , "Small canoe - a palindrome" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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