Metal implant in electronic kelpie (6)

I believe the answer is:

nickel

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

'metal implant' is the definition.
'nickel' can be an answer for 'metal' (I've seen this before). I am not sure about the 'implant' bit.

'in electronic kelpie' is the wordplay.
'in' indicates a hidden word.
'NICKEL' is hidden within 'electronic kelpie'.

Can you help me to learn more?

(Other definitions for nickel that I've seen before include "Silver-white metal" , "Element; five cents in US" , "US five cent piece" , "Metal; US_coin" , "US coin worth five cents" .)

I've seen this clue in the Sydney Morning Herald.

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