Gunners find continued struggles (3,4)
I believe the answer is:
rat race
'gunners find continued struggles' is the definition.
I can't judge whether this definition defines the answer.
'gunners find' is the wordplay.
'gunners' becomes 'RA' (Royal Artillery).
'find' becomes 'trace' (I've seen this before).
'ra'+'trace'='RAT-RACE'
Can you help me to learn more?
(Other definitions for rat race that I've seen before include "Competitive struggle for wealth or power" , "Fiercely competitive working life" , "keen contest" , "hurly-burly of competitive work" , "Working life's struggle" .)