Invalidate for starters archaic names not used lately (5)
I believe the answer is:
annul
'invalidate' is the definition.
(I know that invalidate can be written as annul)
'starters archaic names not used lately' is the wordplay.
'starters' says to take the initial letters.
The first letters of 'archaic names not used lately' is 'ANNUL'.
'for' acts as a link.
(Other definitions for annul that I've seen before include "scratch" , "Cancel, make void" , "Make invalid" , "Repeal, rescind" , "Obligation" .)