Crossword Genius

Standard-bearer taking stones to Welsh river (9)

Ross

I believe the answer is:

flagstaff

'standard-bearer' is the definition.
(I've seen this before)

'stones to welsh river' is the wordplay.
'stones' becomes 'flags' (flag is a kind of stone).
'to welsh river' becomes 'taff' (I've seen this before).
'flags'+'taff'='FLAGSTAFF'

'taking' is the link.

(Other definitions for flagstaff that I've seen before include "Jack may be seen here" , "Flying Pole" , "Arizona community" , "where colours seen" , "Pole for the standard" .)

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