Go wrong as young woman almost gets sack (7)
I believe the answer is:
misfire
'go wrong' is the definition.
(thesaurus)
'young woman almost gets sack' is the wordplay.
'young woman' becomes 'miss' (title for a young woman).
'almost' means to remove the last letter (most of the word but not all of it).
'gets' says to put letters next to each other.
'sack' becomes 'fire' (both can mean to dismiss from a job).
'miss' with its last letter taken away is 'mis'.
'mis'+'fire'='MISFIRE'
'as' acts as a link.
(Other definitions for misfire that I've seen before include "(Of a gun) fail to operate correctly" , "Fail to detonate" , "Fail to go off properly" , "failure to make a report?" .)