Sign my involvement in flings is rebounding (6)
I believe the answer is:
symbol
'sign' is the definition.
(I know that symbol is a type of sign)
'my involvement in flings is rebounding' is the wordplay.
'involvement in' means one lot of letters goes inside another (inserted letters get involved in others).
'flings' becomes 'lobs' (I can't justify this - if you can you should believe this answer much more).
'is rebounding' shows that the letters should be reversed in order (I've seen 'rebounds' mean this).
'my' placed into 'lobs' is 'lobmys'.
'lobmys' written backwards gives 'SYMBOL'.
Can you help me to learn more?
(Other definitions for symbol that I've seen before include "It signifies" , "Badge" , "My lobs (anag)" , "Mark or sign with special meaning" , "Emblem, representation" .)