Idiomatic language of abuse (5)

I believe the answer is:

slang

I'm a little stuck... Click here to teach me more about this clue!

'abuse' is the definition.
(slanging is a kind of abusing)

'idiomatic language' is the wordplay.
'idiomatic' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'language' becomes 'lang'.
's'+'lang'='SLANG'

'of' is the link.

Can you help me to learn more?

(Other definitions for slang that I've seen before include "Patois" , "Be abusive" , "Colloquial language" , "form of language" , "See 15" .)

I've seen this clue in The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.