Crossword Genius

Mercenary old warhorses? (8)

Ross

I believe the answer is:

chargers

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

'warhorses?' is the definition.
(charger is a kind of warhorse)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for chargers that I've seen is " Battery replenishers".)

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