My boss tried mobile, welcoming ring (6)
I believe the answer is:
editor
'my boss' is the definition.
(I've seen this before)
'tried mobile welcoming ring' is the wordplay.
'mobile' indicates anagramming the letters.
'welcoming' is an insertion indicator (in sense of 'inviting in').
'ring' becomes 'o'.
'tried' anagrammed gives 'editr'.
'editr' enclosing 'o' is 'EDITOR'.
(Other definitions for editor that I've seen before include "Press fellow" , "Person who revises and prepares for publication" , "One who determines the final content of a text" , "Person in charge of newspaper" , "Press chief" .)