Crossword Genius

Joiner employed in building industry (6)

Ross

I believe the answer is:

cement

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

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cement that I've seen before include "joiner" , "Material used by builders and dentists" , "It hardens when mixed with water" , "Bind firmly" , "Firmly fix" .)

I've seen this clue in The Sun.
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