Caught you blocking pitch about stuff in meeting (10)

'meeting' is the definition.
('fulfill' can be a synonym of 'meet')

'caught you blocking pitch about stuff' is the wordplay.
I cannot really see how this works, but
'you' could be 'u' (homophones) and 'u' is located in the answer.
'stuff' could be 'filling' (filling is a kind of stuff) and 'filling' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'in' is the link.

Can you help me to learn more?