Crossword Genius

Many a mineral is comparatively costly (4)

Ross

I believe the answer is:

more

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

'many' is the definition.
(associated in meaning)

'a mineral is comparatively costly' is the wordplay.
I cannot really understand how this works, but
'mineral' could be 'ore' (ore is a kind of mineral) and 'ore' is found in the answer.
A single letter 'm' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for more that I've seen before include "author" , "victim of Henry" , "Extra (for Sir Thomas?)" , "Greater quantity or number" , "Additional or larger amount" .)

I've seen this clue in the Evening Standard.
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.