Having no post from me, duly open letters in a different order (10)
I believe the answer is:
unemployed
'having no post' is the definition.
(without a job or post)
'me duly open letters in a different order' is the wordplay.
'letters in a different order' indicates an anagram.
'me'+'duly'+'open'='medulyopen'
'medulyopen' anagrammed gives 'UNEMPLOYED'.
'from' is the link.
(Other definitions for unemployed that I've seen before include "Idle" , "Out of work" , "out of position?" .)