Precedent that’s no longer enough? (7)
I believe the answer is:
example
'precedent' is the definition.
(I've seen this before)
'no longer enough?' is the wordplay.
'no longer' becomes 'ex'.
'enough?' becomes 'ample' (I've seen this in other clues).
'ex'+'ample'='EXAMPLE'
'that's' is the link.
(Other definitions for example that I've seen before include "Standard" , "Something illustrating a general rule" , "Someone to emulate" , "Punishment" , "Ideal - specimen" .)