Fighting and giving a cry of pain in the arena (6)
I believe the answer is:
Here is my best explanation:
'fighting and giving' is the definition.
I can't judge whether this definition defines the answer.
'cry of pain in the arena' is the subsidiary indication.
'cry of pain' becomes 'ow' (I've seen this in other clues).
'in the' means one lot of letters goes inside another.
'arena' becomes 'ring' (I've seen this in other clues).
'ow' put into 'ring' is 'rowing'.
'a' is the link.
(Other definitions for rowing that I've seen before include "Arguing", "Sculling sport?", "Steven Redgrave's sport", "Olympic event", "Sport associated with Henley", "Using oars", "Aquatic sport", "in dispute", "Olympic sport; arguing" and "Propelling boat with oars".)