A new job not quite providing security (6)
I believe the answer is:
anchor
'security' is the definition.
(thesaurus)
'a new job not quite' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'job' becomes 'chore' (synonyms).
'not quite' means to remove the last letter.
'chore' with its last letter taken away is 'chor'.
'a'+'n'+'chor'='ANCHOR'
'providing' is the link.
(Other definitions for anchor that I've seen before include "Last runner in relay race team" , "Firmly secure; moor" , "Mainstay" , "I present" , "Member of relay team" .)