It means a lot to a fellow on the fourth of July (4)
I believe the answer is:
many
'it means a lot' is the definition.
The definition suggests a singular noun but the answer is not.
'a fellow on the fourth of july' is the wordplay.
'a fellow' becomes 'man' (I've seen this before**).
'on' says to put letters next to each other.
'the fourth of july' becomes 'y' (fourth letter of the word 'July').
'man'+'y'='MANY'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for many that I've seen before include "Multitudinous" , "Several" , "Numerous" , "A lot of" , "multitude" .)