Mythical female imitating Cilla (6)
I believe the answer is:
scylla
'mythical female' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for scylla that I've seen before include "danger to shipping" , "Mythical sea monster" , "Charybdis counterpart" , "Peril with Charybdis" , "Rock, across from 21" .)