Crossword Genius

Absolute lunatic with no sense, essentially (5)

Ross

I believe the answer is:

utter

'absolute' is the definition.
(synonyms)

I can't explain the remainder of the clue.

(Other definitions for utter that I've seen before include "Prize" , "Positive" , "Speak; completely" , "mouth" , "Say the words" .)

I've seen this clue in The Hindu.
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