Run out of bistro today (4)
I believe the answer is:
trot
'run' is the definition.
(I know that trot is a type of run)
'out of bistro today' is the wordplay.
'out of' says the answer is hidden in the clue.
'TROT' is hidden in the letters of 'bistro today'.
(Other definitions for trot that I've seen before include "Jog along" , "A slowish run, perhaps by horse" , "Follower of revolutionary" , "Left-winger - move at a fair speed" , "Move at brisk pace" .)