Rag including line in gossip (7)
I believe the answer is:
tattler
'gossip' is the definition.
(I've seen this before)
'rag including line in' is the wordplay.
'rag' becomes 'tatter' (synonyms).
'including line' becomes 'l' (I can't justify this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'tatter' going around 'l' is 'TATTLER'.
Can you help me to learn more?
(Other definitions for tattler that I've seen before include "One who gossips" , "Chatterer" , "gossip" .)