Entirely skint otologist? Not entirely (2,4)
I believe the answer is:
in toto
'entirely' is the definition.
(I've seen this before)
'skint otologist? not entirely' is the wordplay.
'not entirely' says the answer is hidden in the clue.
'IN TOTO' is hidden within 'skint otologist'.
(Other definitions for in toto that I've seen before include "As a whole (Latin)" , "Tranquillity" , "In entirety" , "As a whole (Lat.)" , "Wholly" .)