Require the French lawsuit for etui (10)
I believe the answer is:
'etui' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'require the french lawsuit' is the wordplay.
'require' becomes 'need' (synonyms).
'the french' becomes 'le' ('the' in French).
'lawsuit' becomes 'case' (synonyms).
'for' acts as a link.
Can you help me to learn more?