Countryman's skill in making a timber vessel (9)
I believe the answer is:
woodcraft
'countryman's skill' is the definition.
'woodcraft' can be an answer for 'skill' (woodcraft is a kind of skill). I'm unsure of the 'countryman's' bit.
'a timber vessel' is the wordplay.
'a timber' becomes 'wood' (I've seen this in another clue).
'vessel' becomes 'craft' (synonyms).
'wood'+'craft'='WOODCRAFT'
'in making' acts as a link.
Can you help me to learn more?
(Other definitions for woodcraft that I've seen before include "Skill in camping and related pursuits -- card of two (anag)" , "Carpenter's art?" .)