Go back on a promise concerning one's gadgetry, essentially (6)

I believe the answer is:

renege

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'go back on a promise' is the definition.
(I've seen this before)

'one's gadgetry essentially' is the wordplay.
'one's' becomes 'rene' (I can't justify this - if you can you should give a lot more credence to this answer).
'essentially' says to take the centre.
The middle letters of 'gadgetry' are 'ge'.
'rene'+'ge'='RENEGE'

'concerning' is the link.

Can you help me to learn more?

(Other definitions for renege that I've seen before include "In card games, revoke" , "Go back on an obligation" , "Fail to follow suit at cards" , "Go back on one's word, break promise" , "Fail to carry out a commitment" .)

I've seen this clue in The Irish Times.

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