Large dish, essential for a mobile phone (7)

I believe the answer is:

charger

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'large dish' is the definition.
'charger' can be an answer for 'dish' (I have seen 'old dish' mean 'charger' so perhaps 'dish' could also mean 'charger'). I'm not sure about the 'large' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for charger that I've seen before include "A large dish or a cavalry horse" , "Horse - plate" , "One may provide juice" , "that would prevent loss of power?" , "could be of use to battery" .)

I've seen this clue in The Daily Express.

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