Sensible Victorian remained upright, repressing temptation's commonest aspect (10)
I believe the answer is:
prudential
'remained upright repressing temptation's commonest aspect' is the definition.
I can't judge whether this defines the answer.
'sensible victorian' is the wordplay.
'sensible' becomes 'prudent' ('prudent' can be similar in meaning to 'sensible').
'victorian' becomes 'ial' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'prudent'+'ial'='PRUDENTIAL'
Can you help me to learn more?
(Other definitions for prudential that I've seen before include "exercising sound judgement" , "With due care" , "Canny" .)