Theologian enthralled by opera's musicality (7)

I believe the answer is:

erasmus

'theologian' is the definition.
(I've seen this before)

'enthralled by opera's musicality' is the wordplay.
'enthralled by' indicates a hidden word.
'ERASMUS' is hidden within 'operas musicality'.

(Other definitions for erasmus that I've seen before include "Renaissance scholar" , "Old theologian" , "Dutch mediaeval humanist" , "religious scholar" , "Humanist critical of Church" .)

I've seen this clue in The Everyman puzzle in The Observer.

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