Labelled as an unusual gadget (6)
I believe the answer is:
tagged
'labelled' is the definition.
(I know that labelled can be written as tagged)
'an unusual gadget' is the wordplay.
'an unusual' indicates an anagram.
'gadget' is an anagram of 'TAGGED'.
'as' is the link.
(Other definitions for tagged that I've seen before include "Labelled (electronically?)" , "Marked for future action" , "Attached a label" , "What follower did" , "Trailed along - labelled" .)