Crossword Genius

Part of prison complex (8)

Ross

I believe the answer is:

compound

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'complex' is the definition.
(associated in meaning)

I can't explain the remainder of the clue.

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(Other definitions for compound that I've seen before include "Whole formed by separate elements" , "See 10" , "In this fracture, bone has pierced the skin" , "A mix of ingredients" , "POW camp" .)

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