Group of conspirators have a new role for the Spanish gentleman (9)
I believe the answer is:
caballero
'the spanish gentleman' is the definition.
(I've seen this before)
'group of conspirators have a new role' is the wordplay.
'group of conspirators' becomes 'cabal' (I've seen this in another clue).
'have' says to put letters next to each other.
'a new' indicates an anagram.
'role' is an anagram of 'lero'.
'cabal'+'lero'='CABALLERO'
'for' is the link.
(Other definitions for caballero that I've seen before include "Bear local away for Spanish cavalier" , "Spaniard politely" , "Foreign gentleman" , "Cowboy" , "Spanish gentleman" .)