Skill in making convenient-sounding vessel (10)
I believe the answer is:
handicraft
'skill in making' is the definition.
'handicraft' can be an answer for 'making' (thesaurus). I am not sure about the 'skill in' bit.
'convenient-sounding vessel' is the wordplay.
'convenient' becomes 'handy' (synonyms).
'sounding' shows a homophone (sound like).
'vessel' becomes 'craft' (synonyms).
'handy' sounds like 'handi'.
'handi'+'craft'='HANDICRAFT'
Can you help me to learn more?
(Other definitions for handicraft that I've seen before include "manual skill" , "sewer's output perhaps" .)