Crossword Genius

Child's toy failing to start? Current required (4)

Ross

I believe the answer is:

eddy

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

'child's' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for eddy that I've seen before include "religious leader" , "(Of fluid) circle round" , "Whirlwind" , "Current running against the main stream, causes small whirlpool" , "Ripple" .)

I've seen this clue in The Telegraph.
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