Lucky to get stuck on yacht (5)
I believe the answer is:
jammy
'lucky' is the definition.
'get stuck on yacht' is the wordplay.
'get stuck' becomes 'jam' ('jam' can be a synonym of 'get stuck').
'on' is a charade indicator (letters next to each other).
'yacht' becomes 'my' (abbreviation for motor yacht).
'jam'+'my'='JAMMY'
'to' is the link.
(Other definitions for jammy that I've seen before include "Fortunate; sticky?" , "Lucky - as conserve" , "Lucky (and sticky?)" , "Lucky (informal)" .)