Urges doctor to leave composer (4)

I believe the answer is:

ives

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'composer' is the definition.
(composer Charles Ives)

I cannot understand how the remainder of the clue works.

(Other definitions for ives that I've seen before include "This classical composer" , "Saint of Cornwall or Cambridgeshire" , "US composer, Charles" , "American composer of Three Places in New England, d. 1954" , "US composer, d. 1954 - US folk singer, d. 1995" .)

I've seen this clue in The Irish Times.

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