Tiny greeting for kitchen appliance (9)
I believe the answer is:
microwave
'for kitchen appliance' is the definition.
(microwave is a kind of kitchen appliance)
'tiny greeting' is the wordplay.
'tiny' becomes 'micro' (I've seen this in another clue).
'greeting' becomes 'wave' (I've seen this before).
'micro'+'wave'='MICROWAVE'
(Other definitions for microwave that I've seen before include "(Kitchen) oven" , "Kitchen appliance" , "Kind of oven" , "Fast oven" , "Modern oven using electromagnetism" .)