Otic secretion (6)
I believe the answer is:
earwax
'otic secretion' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for earwax that I've seen before include "Otic deposit" , "Substance accumulating in the lugholes" , "Otic secretion" , "Hearing problem" , "Secretion in the lugholes" .)