Travelled, heading away from Welsh area (4)
I believe the answer is:
went
'travelled' is the definition.
(I've seen this before)
'heading away from welsh area' is the wordplay.
'heading away from' means to remove the first letter.
'welsh area' becomes 'Gwent' (county of Wales).
'gwent' with its initial letter taken off is 'WENT'.
(Other definitions for went that I've seen before include "Proceeded; departed" , "Left; disappeared" , "Travelled" , "Changed location" , "Departed (not hand)" .)