Crossword Genius

Philosopher that's always right (4)

Ross

I believe the answer is:

ayer

'philosopher' is the definition.
(AJ Ayer)

'always right' is the wordplay.
'always' becomes 'aye' (archaic term for 'always').
'right' becomes 'r' (common abbreviation).
'aye'+'r'='AYER'

'that's' acts as a link.

(Other definitions for ayer that I've seen before include "2 [PHILOSOPHER]" , "A.J. - - , philosopher" , "A. J. -, English philosopher" .)

I've seen this clue in the Independent.
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