Language resulting in broken jaw in pub, losing wife (7)
I believe the answer is:
punjabi
'language' is the definition.
(Punjabi is an example)
'broken jaw in pub losing wife' is the wordplay.
'broken' indicates anagramming the letters.
'losing' indicates named letters should be taken away.
'wife' becomes 'w'.
'jaw'+'in'+'pub'='jawinpub'
'jawinpub' with 'w' taken away is 'jainpub'.
'jainpub' is an anagram of 'PUNJABI'.
'resulting in' is the link.
(Other definitions for punjabi that I've seen before include "tongue" , "Subcontinental language" , "talk of Amritsar?" , "From a state in Northwest India" , "foreign language" .)