Bad score lay not too finely (8)

I believe the answer is:

coarsely

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'not too finely' is the definition.
I can't tell whether this defines the answer.

'bad score lay' is the wordplay.
'bad' is an anagram indicator.
'score'+'lay'='scorelay'
'scorelay' anagrammed gives 'COARSELY'.

Can you help me to learn more?

(Other definitions for coarsely that I've seen before include "Commonly" , "rudely" .)

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

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