Publisher, if fearless, conceals officer of the law (7)
I believe the answer is:
sheriff
'officer of the law' is the definition.
(I've seen this before)
'publisher if fearless conceals' is the wordplay.
'conceals' says the answer is hidden in the clue.
'SHERIFF' is hidden within 'publisher if fearless'.
(Other definitions for sheriff that I've seen before include "US law-enforcement officer" , "Lawman of the wild west" , "Crown's chief executive in a county" , "US county law enforcer" , "court officer" .)