Bird in boiling rebellion (5)
I believe the answer is:
grebe
'bird' is the definition.
(type of bird)
'in boiling rebellion' is the wordplay.
'in' indicates a hidden word.
'GREBE' is hidden within 'boiling rebellion'.
(Other definitions for grebe that I've seen before include "Small diving waterfowl with a long neck" , "Duck-sized water-bird" , "Flier" , "Diving bird which may be crested" , "Diving water bird" .)