Crossword Genius

Mortal feud ruinous — that's expressed clearly (10)

Ross

I believe the answer is:

formulated

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'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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