Crossword Genius

Steed provides mobile assistance (7)

Ross

I believe the answer is:

charger

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'steed' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

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(Other definitions for charger that I've seen before include "Horse - plate" , "Type of platter" , "Horse; flat dish" , "One loading" , "What Richard III wanted, perhaps" .)

I've seen this clue in The Mirror.
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