Spoken lingo avoiding normal glossary first of all (5)
I believe the answer is:
slang
'all' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?
'spoken lingo avoiding normal glossary first' is the wordplay.
'first' says to take the initial letters.
The first letters of 'spoken lingo avoiding normal glossary' is 'SLANG'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for slang that I've seen before include "... to scold" , "Vulgar parlance" , "Informal language used by a set of people" , "Any class's jargon" , "See 15" .)