Crossword Genius

A pastry's round layers (6)

Ross

I believe the answer is:

strata

'layers' is the definition.
(I know this)

'a pastry's round' is the wordplay.
'pastry's' becomes 'tart's' (type of pastry).
'round' is a reversal indicator.
'a'+'tarts'='atarts'
'atarts' back-to-front is 'STRATA'.

(Other definitions for strata that I've seen before include "Layers as of rock in the earth's crust" , "Layers of rock on earth's surface" , "Layers or thicknesses of earth" , "Layers into which rocks are divided" , "levels of society" .)

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