Comedy routine in small boat (6)
I believe the answer is:
sketch
'comedy routine' is the definition.
'sketch' can be an answer for 'routine' (thesaurus). I am not sure about the 'comedy' bit.
'small boat' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'boat' becomes 'ketch' (ketch is a kind of sailing vessel).
's'+'ketch'='SKETCH'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for sketch that I've seen before include "Rapid drawing - short play" , "Short comic routine" , "result of quick draw?" , "Short humorous scene" , "Small sailing boat" .)