Pair on time getting nothing quickly (6)
I believe the answer is:
pronto
'quickly' is the definition.
(I've seen this before)
'pair on time getting nothing' is the wordplay.
'pair' becomes 'pr' (abbreviation).
'time' becomes 't' (abbreviation).
'getting' says to put letters next to each other.
'nothing' becomes 'O' (looks like zero - 0).
'pr'+'on'+'t'+'o'='PRONTO'
(Other definitions for pronto that I've seen before include "Right now, immediately" , "Double quick!" , "Quickly (sl.)" , "Quickly, promptly" , "Quickly, without delay" .)