Short title reset on line (6)
I believe the answer is:
little
'short' is the definition.
('little' can be similar in meaning to 'short')
'title reset on line' is the wordplay.
'reset' is an anagram indicator.
'on' is an insertion indicator (as in clothing \'on\' a person).
'line' becomes 'l'.
'title' is an anagram of 'litte'.
'litte' enclosing 'l' is 'LITTLE'.
(Other definitions for little that I've seen before include "Minor" , "Peanuts" , "'Every ...... helps" , "'...... pitchers have large ears'" , "'A . . . . . . knowledge is a dangerous thing'" .)