Stall close to Welsh border (5)
I believe the answer is:
hedge
'stall' is the definition.
(hedging can mean stalling or dithering)
'close to welsh border' is the wordplay.
'close to' says to take the final letters (the 'close' to the word).
'border' becomes 'edge' (synonyms).
The last letter of 'welsh' is 'h'.
'h'+'edge'='HEDGE'
(Other definitions for hedge that I've seen before include "Fence formed by bushes" , "Put off growing" , "sort of fund" , "Row of bushes" , "Boundary of shrubs" .)