Crossword Genius

Harmonium (5)

Ross

I believe the answer is:

organ

'harmonium' is the definition.
(synonyms)

This is all the clue.

(Other definitions for organ that I've seen before include "Church keyboard instrument" , "With prompt enthusiasm" , "What makes use of full stops" , "periodical" , "colon?" .)

I've seen this clue in the New York Times, The Sun and the Evening Standard.
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