Jack hopes somehow to become famous carpenter (6)
I believe the answer is:
joseph
'famous carpenter' is the definition.
(as in Joseph and Mary)
'jack hopes somehow' is the wordplay.
'jack' becomes 'J' (playing card abbreviation).
'somehow' indicates an anagram.
'hopes' with letters rearranged gives 'oseph'.
'j'+'oseph'='JOSEPH'
'to become' is the link.
(Other definitions for joseph that I've seen before include "Biblical dreamcoat wearer" , "Jacob's favourite" , "feature of 21/23 [NATIVITY SCENE]" , "chap" , "subject of musical" .)