Silver, say, provided by Irish tucking into hors d’oeuvre (6)
I believe the answer is:
pirate
'silver say' is the definition.
(Long John Silver in the novel Treasure Island)
'irish tucking into hors d'oeuvre' is the wordplay.
'irish' becomes 'IR' (abbreviation).
'tucking into' indicates putting letters inside.
'hors d'oeuvre' becomes 'pate' (I've seen this in another clue).
'ir' inserted into 'pate' is 'PIRATE'.
'provided by' is the link.
(Other definitions for pirate that I've seen before include "Corsair" , "operating illegally" , "fake" , "Teach, perhaps" , "not officially circulated" .)