Crossword Genius

A flan's flipping layers (6)

Ross

I believe the answer is:

strata

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

'a flan's flipping' is the wordplay.
'flan's' becomes 'tart's'.
'flipping' shows that the letters should be reversed in order.
'a'+'tarts'='atarts'
'atarts' in reverse letter order is 'STRATA'.

(Other definitions for strata that I've seen before include "Layers as of rocks in earth's crust" , "Levels, grades or social classes" , "Layers or social classes" , "Layers as of rock in the earth's crust" , "hard beds" .)

I've seen this clue in the Sydney Morning Herald.
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