Lightweight canoe (5)
I believe the answer is:
kayak
'lightweight canoe' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for kayak that I've seen before include "Small canoe - a palindrome" , "A palindromic canoe for eskimo" , "Inuit craft" , "Boat used by 23 Across" , "Inuit canoe" .)