Crossword Genius

Lousy letters from Lamb, say (7)

Ross

I believe the answer is:

abysmal

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'lousy letters from lamb say' is the definition.
I can't judge whether this defines the answer.

'from lamb say' is the wordplay.
'from' indicates anagramming the letters (from the letters).
'lamb'+'say'='lambsay'
'lambsay' is an anagram of 'ABYSMAL'.

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(Other definitions for abysmal that I've seen before include "Pathetic" , "Deep, immeasurable" , "Immeasurably bad" , "Bottomless - profound" , "Very bad or limitless" .)

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