Sends off letters for jobs (5)
I believe the answer is:
posts
This clue might be a double definition.
'sends off letters' is the first definition.
'posts' can be an answer for 'sends' ('post' can be a synonym of 'send'). I am unsure of the 'off letters' bit.
'jobs' is the second definition.
(post is a kind of job)
'for' acts as a link.
Can you help me to learn more?
(Other definitions for posts that I've seen before include "Mails the uprights?" , "Positions, for guards say" , "Stakes" , "a couple seen propping up the bar?" , "Is dispatching" .)