Crossword Genius

Underlying layers (9)

Ross

I believe the answer is:

substrata

'underlying layers' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for substrata that I've seen before include "Underlying rock layers" , "underlying structures?" , "Lower layers" , "Foundations" , "From lower levels" .)

I've seen this clue in the Sydney Morning Herald and the L.A. Times Daily.
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