Punishment area - I particularly note - is filling function (3,3)
I believe the answer is:
sin bin
'punishment area i' is the definition.
I know nothing about this answer so I can't judge whether this works.
'particularly note is filling function' is the wordplay.
'particularly' becomes 'in' (I can't explain this - if you can you should believe this answer much more).
'note' becomes 'b' (musical note).
'is filling' means one lot of letters goes inside another.
'function' becomes 'sin' (mathematical function).
'in'+'b'='inb'
'inb' going within 'sin' is 'SIN-BIN'.
Can you help me to learn more?
(Other definitions for sin bin that I've seen before include "Place for rugby 'bad boys'" , "Enclosure for suspended player" , "where one was out of play" , "detention centre" .)