Bishop abandons generous approach (4)
I believe the answer is:
road
'approach' is the definition.
(thesaurus)
'bishop abandons generous' is the wordplay.
'bishop' becomes 'b' (abbreviation used in chess).
'abandons' indicates named letters should be taken away.
'generous' becomes 'broad' (eg a 'broad church', a church open to all).
'broad' with 'b' taken away is 'ROAD'.
(Other definitions for road that I've seen before include "Highway or byway" , "Way to achieving a particular outcome" , "mine gallery" , "course" , "Street" .)