Overlook part of Dolomites (4)
I believe the answer is:
omit
'overlook' is the definition.
('omit' can be a synonym of 'overlook')
'part of dolomites' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'OMIT' is hidden in the letters of 'dolomites'.
(Other definitions for omit that I've seen before include "Fail to use" , "Fail to mention" , "Don't include" , "Exclude; veto" , "Leave out or forget" .)