Half the battle is getting it in right (5)
I believe the answer is:
title
'right' is the definition.
(I know that title is a type of right)
'half the battle is getting it' is the wordplay.
'half the' suggests halving the letters.
'is getting' means one lot of letters goes inside another.
'battle' cut in half is 'tle'.
'tle' enclosing 'it' is 'TITLE'.
'in' acts as a link.
(Other definitions for title that I've seen before include "Sir, or madam" , "Proprietorship" , "Designation of honour, rank or office" , "label" , "Name of film, book etc" .)