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A Yardie's ground, supposedly (1,4,3)

Ross

I believe the answer is:

i dare say

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'supposedly' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'a yardie's ground' is the wordplay.
'ground' is an anagram indicator ('grind' the letters into a new form).
'a'+'yardies'='ayardies'
'ayardies' anagrammed gives 'I DARE SAY'.

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(Other definitions for i dare say that I've seen before include "It is probable" , "one might suppose" , "Quite possibly" , "Probably" , "It wouldn't surprise me" .)

I've seen this clue in The Guardian.
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