Crossword Genius

Has half a mind to reduce service, the pennypincher! (5)

Ross

I believe the answer is:

miser

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

'has half' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for miser that I've seen before include "we may find boring" , "One hoarding wealth" , "screw" , "One hoarding money" , "Cheapskate" .)

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