Find current manner wise and will behave appropriately, showing maturity (3,4,3)
I believe the answer is:
act ones age
'maturity' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I don't see?
'find current manner wise and will behave appropriately' is the wordplay.
I cannot really see how this works, but
'current' could be 'ac' (alternating current) and 'ac' is present in the answer.
'manner' could be 'tone' and 'tone' is present in the answer.
'wise' could be 'sage' (similar in meaning) and 'sage' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'showing' is the link.
Can you help me to learn more?
(Other definitions for act ones age that I've seen before include "appear quite grown-up" , "stop being childish" .)