Time to enquire about a job (4)
I believe the answer is:
task
'a job' is the definition.
(I know that job can be written as task)
'time to enquire' is the wordplay.
'time' becomes 't' (abbreviation).
'to enquire' becomes 'ask' (to enquire is to ask or question).
't'+'ask'='TASK'
'about' acts as a link.
(Other definitions for task that I've seen before include "Burden with work" , "Set piece of work" , "exercise" , "Sort of force" , "Piece of work to be done" .)