Crossword Genius

Regret engaging a left-leaning barrister, taking time to find what's needed for court battle (7)

Ross

I believe the answer is:

racquet

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'court battle' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for racquet that I've seen before include "Implement for sport" , "Badminton bat" , "Bat for sport" , "Sports implement sounds noisy" , "Bat used in court games" .)

I've seen this clue in The Independent.
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