Gunners find continued struggles (3,4)

I believe the answer is:

rat race

I'm a little stuck... Click here to teach me more about this clue!

'gunners find continued struggles' is the definition.
I can't tell whether this 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" .)

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