Audibly - audibly permitted (5)
I believe the answer is:
aloud
'audibly' is the definition.
(I've seen this before)
'audibly permitted' is the wordplay.
'audibly' indicates a 'sounds like' (homophone) clue.
'permitted' becomes 'allowed' ('allow' can be a synonym of 'permit').
'allowed' sounds like 'ALOUD'.
(Other definitions for aloud that I've seen before include "Not silently or in a whisper" , "Not sotto voce" , "in a normal voice" , "intended for audience" , "Not under breath" .)