School hypocrisy is inadequate (5)
I believe the answer is:
scant
'inadequate' is the definition.
(I've seen this in another clue)
'school hypocrisy' is the wordplay.
'school' becomes 'S'.
'hypocrisy' becomes 'cant' (I've seen this in other clues).
's'+'cant'='SCANT'
'is' acts as a link.
(Other definitions for scant that I've seen before include "Little" , "Reduce" , "Less than the required amount" , "Minimal (amount)" , "Hardly any" .)