Monitored unusual gadget (6)

I believe the answer is:

tagged

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'monitored' is the definition.
Although both the answer and definition are past participle verbs, I can't understand how one could define the other.

'unusual gadget' is the wordplay.
'unusual' indicates an anagram.
'gadget' is an anagram of 'TAGGED'.

Can you help me to learn more?

(Other definitions for tagged that I've seen before include "Gadget (anag)" , "Trailed along - labelled" , "What follower did" , "Touched a player while s/he was holding the ball" , "Identified electronically" .)

I've seen this clue in The Independent.

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