Crossword Genius

At mount, about to be lacking lustre (4)

Ross

I believe the answer is:

matt

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

'lacking lustre' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe there's a link between them I don't understand?

'at mount about' is the wordplay.
'mount' becomes 'mt'.
'about' means one lot of letters goes inside another.
'at' inserted within 'mt' is 'MATT'.

'to be' acts as a link.

Can you help me to learn more?

(Other definitions for matt that I've seen before include "gospel!" , "Lacking a shine" , "- Lucas (Little Britain)" , "Dull uniform finish" , "book" .)

I've seen this clue in the Sydney Morning Herald.
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