No sex? Just silver in Paris, mate, coming first (6)
'no sex? just silver' is the definition.
I can't tell whether this definition defines the answer.
'paris mate coming first' is the wordplay.
'paris mate' becomes 'agami' (I am not sure about this - if you are sure you should believe this answer much more).
'coming first' becomes 'c' (ast letter of 'coming').
'in' acts as a link.
Can you help me to learn more?
(Other definitions for agamic that I've seen before include "Reproducing asexually; a magic (anag.)", "Asexual".)