Microwave option (4)
I believe the answer is:
thaw
'microwave option' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for thaw that I've seen before include "end of the winter?" , "As Lewis's boss, you'll have seen me" , "spring weather?" , "following 28 [SILVER]" , "snow does eventually" .)