Crossword Genius

Generous amount of heavy sarcasm? (1,3,3)

Ross

I believe the answer is:

a fat lot

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

'sarcasm?' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'generous amount of heavy' is the wordplay.
I cannot really understand how this works, but
'amount' could be 'lot' (lot is a kind of amount) and 'lot' is found within the answer.
'heavy' could be 'fat' (similar in meaning) and 'fat' is found within the answer.
A single letter 'a' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for a fat lot that I've seen is " Not much".)

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