Look after European that Parisian conservation group finds persuasive (8)
I believe the answer is:
eloquent
'persuasive' is the definition.
(I know that persuasive can be written as eloquent)
'look after european that parisian conservation group' is the wordplay.
'look' becomes 'lo' ('lo' is an archaic exclamation meaning 'look!').
'after' says to put letters next to each other.
'european' becomes 'E' (abbreviation e.g. EU).
'that parisian' becomes 'que' ('that' in French).
'conservation group' becomes 'NT' (abbreviation for National Trust).
'lo' put after 'e' is 'elo'.
'elo'+'que'+'nt'='ELOQUENT'
'finds' acts as a link.
(Other definitions for eloquent that I've seen before include "Using language fluently and imaginatively" , "Fluent and persuasive of speech" , "Axilla; oxter" , "Verbally fluent and persuasive" , "Good at speaking" .)