Wife is beginning to demand order — that's being prudent (6)
I believe the answer is:
wisdom
'that's being prudent' is the definition.
I can't judge whether this definition defines the answer.
'wife is beginning to demand order' is the wordplay.
'wife' becomes 'w'.
'beginning to' suggests taking the first letters.
'order' becomes 'om' (Order of Merit).
The initial letter of 'demand' is 'd'.
'w'+'is'+'d'+'om'='WISDOM'
Can you help me to learn more?
(Other definitions for wisdom that I've seen before include "See 13" , "Knowledge gained through experience" , "Knowledge coupled with good judgement" , "Some say it's a combination of experience, knowledge and good judgment" , "This tooth usually comes late" .)