Drawing of small sailing vessel (6)
I believe the answer is:
sketch
'drawing' is the definition.
(sketch is a kind of drawing)
'small sailing vessel' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'sailing vessel' becomes 'ketch' (ketch is a kind of sailing vessel).
's'+'ketch'='SKETCH'
'of' is the link.
(Other definitions for sketch that I've seen before include "Skit" , "Simple drawing" , "Dead parrot featured in one" , "Rough picture" , "Delineate" .)