Star of Stratocaster is Knopfler (8)

I believe the answer is:

asterisk

'star' is the definition.
(I know that asterisk is a class)

'of stratocaster is knopfler' is the wordplay.
'of' indicates the answer is hidden within the clue.
'ASTERISK' is hidden in the letters of 'stratocaster is knopfler'.

(Other definitions for asterisk that I've seen before include "Star-shape on the page" , "Printer's star" , "Sarkiest (Anag)" , "Star shaped symbol" , "Text-marking symbol" .)

I've seen this clue in The Telegraph.

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