Bent on going west on the railway (3)
I believe the answer is:
wry
'bent' is the definition.
(thesaurus)
'going west on the railway' is the wordplay.
'going west' becomes 'w' (synonyms. I am not sure about the 'going' bit.).
'on' is a charade indicator (letters next to each other).
'the railway' becomes 'ry' (abbreviation).
'w'+'ry'='WRY'
'on' acts as a link.
Can you help me to learn more?
(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" .)