Jack and Sean embracing mum (6)
I believe the answer is:
seaman
'jack' is the definition.
(thesaurus)
'sean embracing mum' is the wordplay.
'embracing' is an insertion indicator.
'mum' becomes 'ma' (synonyms).
'sean' going around 'ma' is 'SEAMAN'.
'and' is the link.
(Other definitions for seaman that I've seen before include "Sailor" , "Mariner" , "A manse (anag.)" , "crew member" .)