Name lieutenant knocked over in match (5)
I believe the answer is:
title
'name' is the definition.
(I've seen this before)
'lieutenant knocked over in match' is the wordplay.
'lieutenant' becomes 'lt'.
'knocked over' shows that the letters should be reversed in order.
'in' indicates putting letters inside.
'match' becomes 'tie' (I've seen this before).
'lt' reversed gives 'tl'.
'tl' inserted into 'tie' is 'TITLE'.
(Other definitions for title that I've seen before include "Chapter heading" , "Sir, or madam" , "established claim to ownership" , "label" , "Name of book, picture or rank" .)