Top campanologists? (11)
I believe the answer is:
ringleaders
'top campanologists?' is the definition.
The definition suggests a plural noun which matches the answer.
'top campanologists?' is the wordplay.
I cannot really understand how this works, but
'top' could be 'lead' (both can mean 'most important') and 'lead' is present in the answer.
'campanologists?' could be 'ringers' (I've seen this before) and 'ringers' is located in the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for ringleaders that I've seen before include "Criminal bosses" , "mischief-makers to be found" .)