Crossword Genius

A fellow's in tiny bits (5)

Ross

I believe the answer is:

atoms

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'tiny bits' is the definition.
(I've seen this in another clue)

'a fellow's' is the wordplay.
'fellow' becomes 'toms' (I can't justify this - if you can you should believe this answer much more).
'a'+'toms'='ATOMS'

'in' is the link.

Can you help me to learn more?

(Other definitions for atoms that I've seen before include "Jots" , "Small particles" , "Minute particles" , "Tiny particles" , "Dots" .)

I've seen this clue in The Mirror.
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