Passage from "Clemenza di Tito" (4)

I believe the answer is:

adit

'passage' is the definition.
(adit is a kind of passage)

'from clemenza di tito' is the wordplay.
'from' indicates a hidden word.
'ADIT' can be found hidden inside 'clemenza di tito'.

(Other definitions for adit that I've seen before include "Almost horizontal mine shaft" , "Horiz. mine entrance" , "Mine-shaft" , "Pit access" , "Horizontal mine drainage shaft" .)

I've seen this clue in The Times.

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