Crossword Genius

Cycle courier entering health club to deliver plastering material (6)

Ross

I believe the answer is:

gypsum

'plastering material' is the definition.
(material used in plastering)

I don't understand the rest of the clue.

(Other definitions for gypsum that I've seen before include "Mineral used to make plaster of Paris" , "Ingredient of fertilizer" , "Base of plaster of Paris" , "Alabaster" , "Spy mug made from this white mineral" .)

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