Singer in worst ENO Rigoletto (5)

I believe the answer is:

tenor

'singer' is the definition.
(tenor is a kind of singer)

'in worst eno rigoletto' is the wordplay.
'in' says the answer is hidden in the clue.
'TENOR' is hidden within 'worst eno rigoletto'.

(Other definitions for tenor that I've seen before include "Placido Domingo, say" , "Carreras, for example" , "Pavarotti, maybe" , "Higher male voice" , "High male singing voice like Pavarotti" .)

I've seen this clue in The Sun.

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