Labelled (6)
(Other definitions for titled that I've seen before include "Like a duke, say" , "Noble" , "peer?" , "Like posh fellow" , "Named" .)
'labelled' is the definition.
('tag' can be a synonym of 'label')
This is all the clue.
(Other definitions for tagged that I've seen before include "Labelled (electronically?)" , "Identified electronically" , "Marked for future action" , "Gadget (anag)" , "Touched a player while s/he was holding the ball" .)