Occasionally parrot has nipped after saying hello - do not allow this (8)
I believe the answer is:
prohibit
'occasionally parrot has nipped after saying' is the definition.
I can't tell whether this defines the answer.
'hello do not allow this' is the wordplay.
I cannot really understand how this works, but
'hello' could be 'hi' (synonyms) and 'hi' is located in the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for prohibit that I've seen before include "Proscribe, forbid" , "Forbid, ban" , "Disallow" , "Ban; prevent" , "Stop" .)