New gadget has to be labelled (6)
I believe the answer is:
tagged
'to be labelled' is the definition.
('tagged' can be a synonym of 'labelled')
'new gadget' is the wordplay.
'new' indicates anagramming the letters.
'gadget' with letters rearranged gives 'TAGGED'.
'has' acts as a link.
(Other definitions for tagged that I've seen before include "Gadget (anag)" , "Touched a player while s/he was holding the ball" , "Attached a label" , "Labelled (electronically?)" , "Marked for future action" .)