There's a suggestion of repetition here (5)
I believe the answer is:
ditto
'repetition here' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'there's a suggestion of' is the wordplay.
'there's a suggestion' becomes 'ditt' (I can't explain this - if you can you should believe this answer much more).
'of' becomes 'o''.
'ditt'+'o'='DITTO'
Can you help me to learn more?
(Other definitions for ditto that I've seen before include "Repeat the word(s) above" , "Duplicate" , "Do alternative" , "Two small marks indicating the same again" , "Repeat (instruction)" .)