My boss considered it ordinary, to an extent (6)
I believe the answer is:
editor
'my boss' is the definition.
(I've seen this before)
'considered it ordinary to an extent' is the wordplay.
'to an extent' indicates the answer is hidden within the clue.
'EDITOR' is hidden in the letters of 'considered it ordinary'.
(Other definitions for editor that I've seen before include "Person in charge of a publication" , "Newspaperman" , "Someone in the rag trade" , "Redo it and become head of publication" , "cutter?" .)