Crossword Genius

One who idolises what Leander was? (4-10)

Ross

I believe the answer is:

hero worshipper

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'one who idolises' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for hero worshipper that I've seen before include "He exceedingly admires" , "enthusiastic admirer" , "One who idolises" , "Great admirer" .)

I've seen this clue in The Telegraph.
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