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Outer layer of disintegrating comet flipping hot inside? (8)

Ross

I believe the answer is:

ectoderm

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

'disintegrating comet flipping hot inside?' is the wordplay.
'disintegrating' is an anagram indicator (I've seen 'disintegrated' mean this).
'flipping' says the letters should be written backwards.
'hot' becomes 'red' (I can't justify this - if you can you should believe this answer much more).
'inside?' means one lot of letters goes inside another.
'red' back-to-front is 'der'.
'comet' is an anagram of 'ectom'.
'ectom' going around 'der' is 'ECTODERM'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for ectoderm that I've seen before include "outer layer" , "Embryonic layer" , "Early nervous stage" , "Embryo's outermost layer of cells" , "outer part" .)

I've seen this clue in The Telegraph.
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