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'm 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" .)