Proverb about ending in jail for murder (7)
I believe the answer is:
slaying
'for murder' is the definition.
(synonyms)
'proverb about ending in jail' is the wordplay.
'proverb' becomes 'saying' (I've seen this in another clue).
'about' means one lot of letters goes inside another.
'ending in' suggests the final letters.
The last letter of 'jail' is 'l'.
'saying' going around 'l' is 'SLAYING'.
(Another definition for slaying that I've seen is " Killing".)
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