Crossword Genius

Be ill, perhaps, due to transgression (5)

Ross

I believe the answer is:

libel

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'transgression' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'be ill perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'be'+'ill'='beill'
'beill' is an anagram of 'LIBEL'.

'due to' is the link.

Can you help me to learn more?

(Other definitions for libel that I've seen before include "Defamatory publication" , "Defame falsely" , "Written defamation" , "Published false statement that damages reputation" , "Write ill of" .)

I've seen this clue in the Evening Standard.
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