Crossword Genius

Bush, the rock ’n' roll pioneer? (5)


I believe the answer is:


I'm a little stuck... Click here to teach me more about this clue!

'bush the rock' is the definition.
'holly' can be an answer for 'bush' (holly is a type of bush). I am not certain of the 'the rock' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for holly that I've seen before include "Shrub with red berries" , "Shrub with scarlet berries" , "Ilex is its genus" , "Evergreen tree with spiky leaves" , "It has red berries and glossy leaves with prickles" .)

I've seen this clue in The Guardian.
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