Crossword Genius

Legally only of minor importance (5,3)

Ross

I believe the answer is:

under age

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'legally only of' is the first definition.
The definition suggests a singular noun which matches the answer.

'minor importance' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Other definitions for under age that I've seen before include "Like a minor" , "Too young" , "Immature" , "less than 18?" .)

I've seen this clue in The Globe and Mail.
Want a hint initially instead of a full solution? Install my app