The senora’s good sense (6)

I believe the answer is:

reason

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'good sense' is the definition.

'the senora's' is the wordplay.
'senora' anagrams to 'REASON'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for reason that I've seen before include "Capacity for rational thought" , "Justification needed" , "Motive; argue" , "use of wit" , "'Motivation, grounds (6)'" .)

I've seen this clue in the Evening Standard.

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