Composer broadcast towering study (5)

I believe the answer is:

haydn

'composer' is the definition.
(I know that Haydn is an composer)

I can't explain the remainder of the clue.

(Other definitions for haydn that I've seen before include "Austrian symphonist, d. 1809" , "Josef --, prolific composer" , "The Surprise symphony composer, d. 1809" , "Composer of over 100 symphonies" , "Creation composer" .)

I've seen this clue in The Guardian.

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