Capacity for rational thought (6)

I think it could be either:

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reason

'capacity for rational thought' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for reason that I've seen before include "Logic and rationality" , "'Motivation, grounds (6)'" , "Explanation or justification" , "Think in a logical way" , "Logic of senora" .)

I've seen this clue in The Irish Times.

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