"Just a ___!" (3)

I believe the answer is:
sec
(Other definitions for sec that I've seen before include "sparkling?" , "period not lasting long" , "(Of wines) dry" , "Jiffy" , "21 down, as wine" .)
I believe the answer is:
sec
(Other definitions for sec that I've seen before include "sparkling?" , "period not lasting long" , "(Of wines) dry" , "Jiffy" , "21 down, as wine" .)