Singer, needing no introduction, recalled material from the Highlands and Islands (7)
I believe the answer is:
sinatra
'material from the highlands and islands' is the definition.
I can't tell whether this defines the answer.
'singer needing no introduction recalled' is the wordplay.
'singer' becomes 'art' (Art Garfunkel of Simon and Garfunkel).
'needing no introduction' becomes 'anis' (I can't explain this - if you can you should believe this answer much more).
'recalled' says the letters should be written in reverse.
'art'+'anis'='artanis'
'artanis' back-to-front is 'SINATRA'.
(Other definitions for sinatra that I've seen before include "Was his singing a strain?" , "Francis Albert, mourned singer" , "Francis Albert, 1915-1998" , "Entertainer" , "Francis Albert did it his way" .)