Crossword Genius

Showing an ironic sort of loving care, secret minder fiddled with electronic implant (6,7)

Ross

I believe the answer is:

'showing an ironic sort of loving care' is the definition.
(ironic term for poor or dangerous treatment)

I don't understand how the rest of the clue works.

(Another definition for tender mercies that I've seen is "You only throw yourself on these belonging to another in extremis!".)

I've seen this clue in The Guardian.