Job advert online, perhaps (4)
I believe the answer is:
post
This clue is a double definition.
'job' is the first definition.
(post is a kind of job)
'advert online perhaps' is the second definition.
(Other definitions for post that I've seen before include "type of support" , "Member < to comment on website" , "Publish' mail' job" , "Job - letters - stake in ground" , "Send via the mail" .)