Time to enter new career as supplier of food (7)
I believe the answer is:
caterer
'supplier of food' is the definition.
(I've seen this before)
'time to enter new career' is the wordplay.
'time' becomes 't'.
'to enter' is an insertion indicator.
'new' indicates an anagram.
'career' is an anagram of 'caerer'.
't' inserted into 'caerer' is 'CATERER'.
'as' acts as a link.
(Other definitions for caterer that I've seen before include "Provider of food/drink" , "Provider of food and drink" , "One supplying needs" , "One providing food and drink" , "Someone providing food and service" .)