Initially silent passage (5)

I believe the answer is:

aisle

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'passage' is the definition.
(aisle can mean a path or passageway)

I cannot understand how the rest of the clue works.

(Other definitions for aisle that I've seen before include "way to the altar?" , "Here comes the bride" , "'Passage, gangway (5)'" , "Divide in a church" , "Passage between seating blocks" .)

I've seen this clue in the Evening Standard.

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