Trailed along with a label on (6)
I believe the answer is:
tagged
'trailed' is the definition.
('tag' can be a synonym of 'trail')
'along with a label on' is the wordplay.
'along with' becomes 'ged' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a label' becomes 'tag' (tag is a kind of label).
'on' is a charade indicator (letters next to each other).
'ged' after 'tag' is 'TAGGED'.
Can you help me to learn more?
(Other definitions for tagged that I've seen before include "Marked for future action" , "Attached a label" , "Identified electronically" , "Touched a player while s/he was holding the ball" , "Trailed along - labelled" .)