New Delhi, after Sunday, gets protection (6)
I believe the answer is:
shield
'protection' is the definition.
(I've seen this before)
'new delhi after sunday' is the wordplay.
'new' indicates anagramming the letters.
'after' is a charade indicator (letters next to each other).
'sunday' becomes 's'.
'delhi' with letters rearranged gives 'hield'.
'hield' put after 's' is 'SHIELD'.
'gets' is the link.
(Other definitions for shield that I've seen before include "He slid (anag)" , "Protect - prize" , "Piece of protective armour" , "Protective plate" , "Protective covering" .)