She mentions me repeatedly (4)
I believe the answer is:
mimi
'she' is the definition.
'mentions me repeatedly' is the wordplay.
'mentions' becomes 'm' (this could be a standard abbreviation which I don't know about).
'me' becomes 'I'.
'repeatedly' indicates the doubling of some letters.
'm'+'i'='mi'
'mi' doubled is 'MIMI'.
Can you help me to learn more?
(Other definitions for mimi that I've seen before include "Puccini heroine" , "I'm upset twice by the operatic girl" , "Tragic Parisienne" , "unfortunate sewer" , "showgirl" .)