Society unwilling to show laziness (5)
I believe the answer is:
sloth
'laziness' is the definition.
(I know that laziness can be written as sloth)
'society unwilling' is the wordplay.
'society' becomes 's' (common abbreviation in names of organisations).
'unwilling' becomes 'loth' (similar in meaning).
's'+'loth'='SLOTH'
'to show' is the link.
(Other definitions for sloth that I've seen before include "Deadly offence" , "edentate" , "One's often suspended from tree" , "one of a deadly group" , "Inertia" .)