Abuse in common parlance (5)
I believe the answer is:
slang
This clue could be a double definition.
'abuse' is the first definition.
(slanging is a kind of abusing)
'common parlance' is the second definition.
'slang' can be an answer for 'parlance' (I have seen 'Vulgar parlance' mean 'slang' so perhaps 'parlance' could also mean 'slang'). I'm not sure about the 'common' bit.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for slang that I've seen before include "Informal language - jargon" , "type of language?" , "abuse" , "Any class's jargon" , "Vernacular" .)