Crossword Genius

Smashing day with breadbasket is sanctuary (6)

Ross

I believe the answer is:

adytum

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

I don't understand the remainder of the clue.

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(Other definitions for adytum that I've seen before include "Temple sanctuary" , "inner sanctum" , "Inner room" , "sacred space" , "ancient sanctuary" .)

I've seen this clue in The Times and The Sunday Times.
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