Crossword Genius

Subversive character finally learnt good sense (15)

Ross

I believe the answer is:

treasonableness

'subversive character' is the definition.

'finally learnt good sense' is the wordplay.
'finally' suggests the final letters.
'good sense' becomes 'reasonableness'.
The final letter of 'learnt' is 't'.
't'+'reasonableness'='TREASONABLENESS'

(Another definition for treasonableness that I've seen is " Disloyal quality".)

I've seen this clue in The Times.
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