Crossword Genius

Naval architect? (4)

Ross

I believe the answer is:

wren

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'architect' is the definition.
(Christopher Wren, 17th-century architect)

I cannot understand how the rest of the clue works.

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(Other definitions for wren that I've seen before include "Tiny brown songbird with short erect tail" , "Type of small bird" , "Navy girl" , "Architect of St Paul's Cathedral" , "Small active brown northern hemisphere bird" .)

I've seen this clue in The Mirror.
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