Crossword Genius

Debatable beastly utterance by an East Ender (4)

Ross

I believe the answer is:

moot

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'debatable' is the definition.
(synonyms)

'beastly utterance by an east ender' is the wordplay.
'beastly utterance' becomes 'moo' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'by' is a charade indicator (letters next to each other).
'ender' says to take the final letters (I've seen 'ending' mean this).
The last letter of 'east' is 't'.
'moo'+'t'='MOOT'

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(Other definitions for moot that I've seen before include "raise for discussion" , "Undecided as a debatable point may be" , "Propose for discussion" , "Open to question" , "Controversial" .)

I've seen this clue in the Evening Standard.
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