Nobody makes Philip tweet (9)

I believe the answer is:
pipsqueak
'nobody' is the definition.
(pipsqueak is a kind of nobody)
'philip tweet' is the wordplay.
'philip' becomes 'pip' (can be a nickname for Philip).
'tweet' becomes 'squeak' (I can't explain this - if you can you should give a lot more credence to this answer).
'pip'+'squeak'='PIPSQUEAK'
'makes' acts as a link.
Can you help me to learn more?
(Other definitions for pipsqueak that I've seen before include "Contemptible person" , "Insignificant person" , "Nobody" , "Shrimp" , "Whippersnapper" .)