A very tiny part of the anatomy (4)

I believe the answer is:

atom

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'a very tiny part' is the definition.
'atom' can be an answer for 'part' (I have seen 'Part of molecule ' mean 'atom' so perhaps 'part' could also mean 'atom'). I'm not sure about the 'a very tiny' bit.

'of the anatomy' is the wordplay.
'of' indicates a hidden word.
'ATOM' is hidden in the letters of 'anatomy'.

Can you help me to learn more?

(Other definitions for atom that I've seen before include "Smallest unit of matter" , "Part of molecule" , "type of bomb" , "A small but mighty particle" , "Tiny particle, great bomb" .)

I've seen this clue in The Irish News.

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