Warm salutation (5)
I believe the answer is:
toast
I believe this clue is a double definition.
'warm' is the first definition.
(toast can mean to heat up)
'salutation' is the second definition.
(as in toasting someone with a drink)
(Other definitions for toast that I've seen before include "Make bread brown and crisp" , "A bit of a bloomer, possibly" , "Browned bread; health" , "It's found under marmalade and butter" , "Breakfast slice" .)