Attenborough, say, is one revealing all about animal's skin (10)
I believe the answer is:
naturalist
'attenborough say is one' is the definition.
I can't judge whether this defines the answer.
'all about animal's skin' is the wordplay.
'all' becomes 'naturist' (I am not sure about this - if you are sure you should believe this answer much more).
'about' means one lot of letters goes inside another.
'skin' suggests removing the centre (only the skin or outside of the word is used).
'animal' with its centre taken out is 'al'.
'naturist' placed around 'al' is 'NATURALIST'.
'revealing' acts as a link.
Can you help me to learn more?
(Other definitions for naturalist that I've seen before include "One who studies animals and plants" , "Darwin?" , "Zoology expert possibly" , "Student of zoology or botany" , "Zoologist" .)