Crossword Genius

A hat for non-inheritable declining hairline? (6)

Ross

I believe the answer is:

bonnet

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

'a hat' is the definition.
(I know this)

'non-inheritable declining hairline?' is the wordplay.
I cannot quite see how this works, but
an anagram of 'non' is 'onn' which is present in the answer.
The remaining letters 'bet' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'for' acts as a link.

Can you help me to learn more?

(Other definitions for bonnet that I've seen before include "Headgear -engine cover" , "Over; mentioned earlier" , "Headwear for a car?" , "Cover for head or engine" , "Hat - American hood" .)

I've seen this clue in The Irish Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.