Words concealing nothing - European is loquacious (7)
I believe the answer is:
verbose
'loquacious' is the definition.
(I've seen this before)
'words concealing nothing european' is the wordplay.
'words' becomes 'verbs' (verb is a kind of word).
'concealing' is an insertion indicator.
'nothing' becomes 'O' (looks like zero - 0).
'european' becomes 'e' (abbreviation e.g. EU).
'verbs' going around 'o' is 'verbos'.
'verbos'+'e'='VERBOSE'
'is' acts as a link.
(Other definitions for verbose that I've seen before include "Talkative, given to saying too much" , "Circumlocutory" , "Loquacious" , "'Long-winded, wordy (7)'" , "Using too many words, too talkative" .)