Crossword Genius

Such monkeys don't do certain things (5)

Ross

I believe the answer is:

brass

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

This clue could be a double definition.

'such monkeys don't' is the first definition.
The definition suggests a singular noun which matches the answer.

'do certain things' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

Can you help me to learn more?

(Other definitions for brass that I've seen before include "Readies" , "memorial in church" , "Boldness" , "Descriptive of 7's instrument" , "Ready" .)

I've seen this clue in the Evening Standard.
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