Crossword Genius

Good person — most competent and most sane? (8)

Ross

I believe the answer is:

stablest

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'most sane?' is the definition.
Both the definition and answer are superlative adjectives. Perhaps there's an association between them I don't understand?

'good person most competent' is the wordplay.
'good person' becomes 'st' (saint).
'most competent' becomes 'ablest' ('able' can be similar in meaning to 'competent').
'st'+'ablest'='STABLEST'

'and' is the link.

Can you help me to learn more?

(Other definitions for stablest that I've seen before include "Most unshakable" , "superlatively durable" , "most secure" .)

I've seen this clue in The Times.
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