Loudly complaining as reservation is cancelled centrally (6)
I believe the answer is:
booing
'loudly complaining' is the definition.
The definition and answer can be both to do with communicating as well as being present participle verbs.
Maybe they are linked in a way I don't understand?
'as reservation is cancelled centrally' is the wordplay.
I cannot quite understand how this works, but
'as' could be 'in' (I've seen this in other clues) and 'in' is present 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 booing that I've seen before include "Disapproval from crowd" , "Shouting disapproval" , "Noisy disapproval" .)