Doctor cures nits accepting I go over with a fine-toothed comb (10)
I believe the answer is:
scrutinise
'go over with a fine-toothed comb' is the definition.
(to study in close detail)
'doctor cures nits accepting i' is the wordplay.
'doctor' is an anagram indicator.
'accepting' indicates putting letters inside.
'cures'+'nits'='curesnits'
'curesnits' is an anagram of 'scrutnise'.
'scrutnise' going around 'i' is 'SCRUTINISE'.
(Other definitions for scrutinise that I've seen before include "Examine closely - runs cities (anag)" , "Carefully examine" .)