Composer felt Gogarty contributed some essential pieces (5)

I believe the answer is:

elgar

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'composer' is the definition.
(Edward Elgar)

I don't understand the remainder of the clue.

(Other definitions for elgar that I've seen before include "[NIMROD] 's creator" , "13 composer, 1857-1934" , "Score-person" , "Glare at great English composer" , "He scored" .)

I've seen this clue in The Irish Times.

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