Little matters as Tom found out (5)

I believe the answer is:

atoms

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'little matters' is the definition.
'atoms' can be an answer for 'matters' (atom is a kind of matter). I am unsure of the 'little' bit.

'as tom found out' is the wordplay.
'found out' indicates an anagram (discovered out of the normal letter order).
'as'+'tom'='astom'
'astom' is an anagram of 'ATOMS'.

Can you help me to learn more?

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

I've seen this clue in The Globe and Mail.

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