Modified Rio delta variant (8)
I believe the answer is:
tailored
'variant' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?
'modified rio delta' is the wordplay.
'modified' indicates an anagram.
'rio'+'delta'='riodelta'
'riodelta' with letters rearranged gives 'TAILORED'.
Can you help me to learn more?
(Other definitions for tailored that I've seen before include "Fitted, well-cut" , "Cut to fit" , "Made garments, suits perhaps" , "(Of clothes) fitted, well cut" , "Made to measure for idolater" .)