Complete some treatment - otalgia especially (5)
I believe the answer is:
total
'complete' is the definition.
('total' can be a synonym of 'complete')
'some treatment otalgia especially' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'TOTAL' is hidden within 'treatment otalgia especially'.
(Other definitions for total that I've seen before include "Sum, aggregation" , "Full, entire amount" , "given by 8 [ADDING MACHINES]" , "Entirety" , "Entire sum" .)