Benefits of public transport initially overlooked (4)
I believe the answer is:
uses
'benefits' is the definition.
(I've seen this in another clue)
'public transport initially overlooked' is the wordplay.
'public transport' becomes 'buses' (I've seen this before).
'initially overlooked' means to remove the first letter.
'buses' with its initial letter taken away is 'USES'.
'of' is the link.
(Other definitions for uses that I've seen before include "Consumes; treats" , "Operates" , "'Purposes, functions (4)'" , "manipulates" , "Employs" .)