Old man needing year to travel west in bark (3)
I believe the answer is:
yap
'bark' is the definition.
(yapping is a kind of barking)
'old man needing year to travel west' is the wordplay.
'old man' becomes 'pa' (both can mean father).
'needing' is a charade indicator (letters next to each other).
'year' becomes 'y'.
'to travel west' is a reversal indicator.
'pa'+'y'='pay'
'pay' in reverse letter order is 'YAP'.
'in' acts as a link.
(Other definitions for yap that I've seen before include "Bark incessantly" , "Pay up for shrill bark (3" , "Complain shrilly" , "Natter; small dog's bark" , "Yelp" .)