Taxi meter fiddled — penalties might follow this (5,4)
I believe the answer is:
extra time
'penalties might follow this' is the definition.
(extra time might follow penalties in football)
'taxi meter fiddled' is the wordplay.
'fiddled' indicates anagramming the letters.
'taxi'+'meter'='taximeter'
'taximeter' with letters rearranged gives 'EXTRA TIME'.
(Other definitions for extra time that I've seen before include "Extension to match" , "this could lead to a shoot-out" , "play's extension" , "could lead to penalties?" , "may lead to penalties" .)