Feast I prepared for Spanish celebration, say (6)
I believe the answer is:
fiesta
'spanish celebration say' is the definition.
(Spanish word for a festival)
'feast i prepared' is the wordplay.
'prepared' is an anagram indicator.
'feast'+'i'='feasti'
'feasti' with letters rearranged gives 'FIESTA'.
'for' acts as a link.
(Other definitions for fiesta that I've seen before include "Spanish party" , "Feast day" , "public event abroad" , "Saint's day; carnival" , "Religious festival in Hispanic communities" .)