Expressive line omitting one quote in translation (8)
I believe the answer is:
eloquent
'expressive' is the definition.
(eloquent means expressive or articulate)
'line omitting one quote in translation' is the wordplay.
'omitting' indicates named letters should be taken away.
'one' becomes 'i' (Roman numeral).
'in translation' is an anagram indicator (I've seen this in other clues).
'line' with 'i' removed is 'lne'.
'lne'+'quote'='lnequote'
'lnequote' anagrammed gives 'ELOQUENT'.
(Other definitions for eloquent that I've seen before include "Using language fluently and imaginatively" , "Axilla; oxter" , "Persuasive, as a speaker" , "Silver-tongued, articulate" , "Speaking powerfully" .)