Short on pizazz (4)
I believe the answer is:
flat
'short on pizazz' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for flat that I've seen before include "Unnatural - uninteresting - apartment" , "Apartment - below the note" , "Lacking interest" , "razed to the ground, having had blow-out" , "In music, below the correct pitch" .)