Nominally an Ethel Merman part (5)

I believe the answer is:

elmer

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'nominally an ethel merman part' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'nominally an ethel merman part' is the wordplay.
'part' says the answer is hidden in the clue.
'ELMER' can be found hidden inside 'nominally ethel merman'.

Can you help me to learn more?

(Other definitions for elmer that I've seen before include "____ Rice, US dramatist" , "- - Gantry (book, film)" , "Man" , "name" .)

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