Homer's son has somewhere to drink tea initially (4)
I believe the answer is:
bart
'homer's son' is the definition.
(I've seen this before)
'somewhere to drink tea initially' is the wordplay.
'somewhere to drink' becomes 'bar' (I am not sure about this - if you are sure you should believe this answer much more).
'initially' says to take the initial letters.
The first letter of 'tea' is 't'.
'bar'+'t'='BART'
'has' is the link.
Can you help me to learn more?
(Other definitions for bart that I've seen before include "Branch of Islam" , "Son in The Simpsons" , "Small title-holder being a brat" , "Homer's son" .)