No leech changed position (7)
I believe the answer is:
echelon
'position' is the definition.
(I know that echelon is a type of position)
'no leech changed' is the wordplay.
'changed' indicates an anagram.
'no'+'leech'='noleech'
'noleech' anagrammed gives 'ECHELON'.
(Other definitions for echelon that I've seen before include "Tier" , "Level or rank of authority, upper or lower" , "Military stepped formation" , "Staggering display of military" , "Level in hierarchy" .)