Mortal feud ruinous — that's expressed clearly (10)
I believe the answer is:
formulated
'expressed clearly' is the definition.
'formulated' can be an answer for 'expressed' (formulating is a kind of expressing). I'm unsure of the 'clearly' bit.
'mortal feud ruinous' is the wordplay.
'ruinous' indicates an anagram.
'mortal'+'feud'='mortalfeud'
'mortalfeud' anagrammed gives 'FORMULATED'.
'that's' acts as a link.
Can you help me to learn more?
I've seen this clue in The Independent.
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