On the pitch that hurts a long way (3,4)
I believe the answer is:
own goal
'on the pitch' is the definition.
I can't tell whether this definition defines the answer.
'that hurts a long way' is the wordplay.
'that hurts' becomes 'ow!'.
'way' indicates an anagram (another way of arranging the letters).
'a'+'long'='along'
'along' with letters rearranged gives 'ngoal'.
'ow'+'ngoal'='OWN GOAL'
(Other definitions for own goal that I've seen before include "Self-inflicted wound" , "Self-inflicted problem" , "A score against self, as by soccer player" , "Self-inflicted setback" , "bad mistake" .)