Plug it back on to induce current (7)

I believe the answer is:

tampion

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'plug' is the definition.
(I've seen this before)

'it back on to induce current' is the wordplay.
'back' suggests the final letters.
'on' means one lot of letters go next to another.
'to induce' becomes 'ion' (I am not sure about this - if you are sure you should believe this answer much more).
'current' becomes 'amp' (electricity).
The final letter of 'it' is 't'.
'ion' after 'amp' is 'ampion'.
't'+'ampion'='TAMPION'

Can you help me to learn more?

(Another definition for tampion that I've seen is " plug".)

I've seen this clue in The Hindu.

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