Crossword Genius

Impulsive right remains... (4)

Ross

I believe the answer is:

rash

'impulsive' is the definition.
(thesaurus)

'right remains' is the wordplay.
'right' becomes 'r' (common abbreviation).
'remains' becomes 'ash' (I've seen this before).
'r'+'ash'='RASH'

(Other definitions for rash that I've seen before include "Harum-scarum" , "Flood" , "Over-hasty, reckless" , "Daredevil" , "Ill-considered - outbreak" .)

I've seen this clue in The Telegraph.
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