Franz, whose Widow made Merry music (5)

I believe the answer is:

lehar

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This might be a double definition.

'franz' is the first definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?

'widow made merry music' is the second definition.
The definition suggests a singular noun which matches the answer.

'whose' acts as a link.

Can you help me to learn more?

(Other definitions for lehar that I've seen before include "Operettist" , "Viennese composer" , "Hungarian who composed" , "Franz -----, composer of The Merry Widow" , "Musician" .)

I've seen this clue in the Evening Standard.

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