An aquatic performer of some diversity (5)
I believe the answer is:
diver
'an aquatic' is the definition.
I can't judge whether this defines the answer.
'performer of some diversity' is the wordplay.
'performer of' becomes 'dive' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'some' indicates the central letters.
The middle of 'diversity' is 'r'.
'dive'+'r'='DIVER'
Can you help me to learn more?
(Other definitions for diver that I've seen before include "Cheating footballer" , "One jumping off board" , "Large waterbird" , "Drive (anag.)" , "Person operating under water" .)