Crossword Genius

Angry man not taking booze inside (5)

Ross

I believe the answer is:

ratty

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'angry' is the definition.
(thesaurus)

'man not taking booze inside' is the wordplay.
'man' becomes 'r' (abbreviation for rook, a chess piece or 'man').
'not taking booze inside' becomes 'atty' (I can't explain this - if you can you should believe this answer much more).
'r'+'atty'='RATTY'

Can you help me to learn more?

(Other definitions for ratty that I've seen before include "Fictional mole's chum" , "character on the river bank" , "Moley's friend" , "Bad tempered" , "infestation of vermin" .)

I've seen this clue in The Sun.
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