Snap, though calm (5)
I believe the answer is:
still
This clue is a triple definition!
'snap' is the first definition.
(I've seen this before)
'though' is the second definition.
(thesaurus)
'calm' is the third definition.
(I've seen this before)
(Other definitions for still that I've seen before include "Snap" , "inaudible" , "sort of life" , "not bubbly" , "Unmoving yet" .)