Sally is about to accept one job (7)
I believe the answer is:
riposte
'sally' is the definition.
(thesaurus)
'about to accept one job' is the wordplay.
'about' becomes 're' (regarding**).
'to accept' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'job' becomes 'post' (post is a kind of job).
'i'+'post'='ipost'
're' enclosing 'ipost' is 'RIPOSTE'.
'is' is the link.
(Other definitions for riposte that I've seen before include "Repartee; quick thrust (fencing)" , "Snappy comeback" , "Reply, retort" , "Sharp answer" , "Rejoinder" .)