A name meaning very little (4)
I believe the answer is:
atom
'meaning very little' is the definition.
'atom' can be an answer for 'little' (thesaurus). I am not certain of the 'meaning very' bit.
'a name' is the wordplay.
'name' becomes 'tom' ().
'a'+'tom'='ATOM'
Can you help me to learn more?
(Other definitions for atom that I've seen before include "Basic unit of a chemical element" , "The tiniest particle" , "A really tiny piece of something" , "Minute particle" , "Something very small perhaps" .)