Oddly, Bella Hadid's beginning again and again, and so on (4,4,4)

'again and so on' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'oddly bella hadid's beginning again' is the wordplay.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
'beginning' says to take the initial letters.
'again' becomes 'blahblah' (I can't justify this - if you can you should give a lot more credence to this answer).
The first letter of 'hadid' is 'h'.
The alternating letters of 'bella' are 'bla'.
'bla'+'h'+'blahblah'='BLAH BLAH BLAH'

'and' is the link.

Can you help me to learn more?