Crossword Genius

Protestant clumsily dropping books in part of church (8)

Ross

I believe the answer is:

transept

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'part of church' is the definition.
('transept' is part of 'church')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for transept that I've seen before include "Side part of a church" , "Something dividing church in two" , "Crossing part of a church" , "Part of church off aisle" , "Arm of church body" .)

I've seen this clue in The Times.
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