One doing a crushing and grinding job (5)

I believe the answer is:

molar

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

'grinding job' is the definition.
'molar' can be an answer for 'grinding' (I've seen this in another clue). I'm not sure about the 'job' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for molar that I've seen before include "Dealing with masses" , "Moral (anag.)" , "Chewer and grinder" , "that could be capped" , "Broad-crowned tooth" .)

I've seen this clue in the Evening Standard.

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