Free masks and nationwide, urgent, methodical immunity testing, for starters! (7)
I believe the answer is:
manumit
'free' is the definition.
(I've seen this before)
'masks and nationwide urgent methodical immunity testing for starters' is the wordplay.
'for starters' indicates taking the first letters.
The initial letters of 'masks and nationwide urgent methodical immunity testing' is 'MANUMIT'.
(Other definitions for manumit that I've seen before include "release" , "Set free from slavery - anti-mum (anag)" , "deliver" .)