Bent on going west on the railway (3)
I believe the answer is:
wry
'bent' is the definition.
(thesaurus)
'on going west on the railway' is the wordplay.
'going' suggests deleting specific letters.
'west' becomes 'W' (abbreviation).
'the railway' becomes 'ry' (abbreviation for railway).
'w'+'on'+'ry'='wonry'
'wonry' with 'on' taken out is 'WRY'.
(Other definitions for wry that I've seen before include "Of humour, dry and mocking" , "Dry and mocking, or bent out of shape" , "Drily humorous" , "Twisted; sardonic" , "Ironically humorous" .)