Question about stray in boat (6)
I believe the answer is:
wherry
'boat' is the definition.
(I've seen this before)
'question about stray' is the wordplay.
'question' becomes 'why' (I've seen this in other clues).
'about' indicates putting letters inside.
'stray' becomes 'err' ('err' can be a synonym of 'stray').
'why' going around 'err' is 'WHERRY'.
'in' is the link.
(Other definitions for wherry that I've seen before include "Light rowing boat" , "vessel made" , "Shallow boat" , "Barge; small rowing-boat" , "Kind of barge" .)