Reversible canoe (5)
I believe the answer is:
kayak
I believe this clue is a double definition.
'reversible' is the first definition.
'canoe' is the second definition.
('kayak' can be a synonym of 'canoe')
(Other definitions for kayak that I've seen before include "Inuit craft" , "Small canoe - a palindrome" , "Small canoe with a light frame" , "Type of canoe" , "Boat used by 23 Across" .)