Frequent title starter (3)
I believe the answer is:
the
'frequent title starter' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for the that I've seen before include "The most frequently occurring word in the Bible (and in this clue!)" , "Base of ever-expanding nursery rhyme" , "Born - - - - - - - - (carol)" , "15, 16 One given taste of own medicine" , "See 10 Across" .)