Bony protuberance in hornbill caught like that in Paris (6)
I believe the answer is:
casque
'bony protuberance in hornbill' is the definition.
I can't tell whether this definition defines the answer.
'caught like that in paris' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'like' becomes 'as'.
'that in paris' becomes 'que' (I can't justify this - if you can you should believe this answer much more).
'c'+'as'+'que'='CASQUE'
Can you help me to learn more?
(Other definitions for casque that I've seen before include "French helmet" , "Covering for head" , "An old helmet from France?" .)