Second boat in quickly-made image (6)
I believe the answer is:
sketch
'image' is the definition.
(thesaurus)
'second boat' is the wordplay.
'second' becomes 's' (common abbreviation).
'boat' becomes 'ketch' (ketch is a type of sailing boat).
's'+'ketch'='SKETCH'
'in quickly-made' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for sketch that I've seen before include "Outline - preliminary drawing" , "An outline drawing or a comedy number" , "Unfinished drawing" , "draft" , "Dead parrot featured in one" .)