Figures some axioms to be in the vernacular (5)
I believe the answer is:
idiom
'the vernacular' is the definition.
(I've seen this in another clue)
'figures some axioms' is the wordplay.
'figures' becomes 'idi' (I can't explain this - if you can you should believe this answer much more).
'some' indicates the central letters.
'axioms' becomes 'gnomes' (gnome is a kind of axiom).
The centre of 'gnomes' is 'om'.
'idi'+'om'='IDIOM'
'to be in' is the link.
Can you help me to learn more?
(Other definitions for idiom that I've seen before include "Colloquialism" , "Dialect, vernacular" , "Characteristic mode of expression" , "Characteristic language of people or group" , "Figure of speech" .)