Limited yours truly to changing gear (6)
I believe the answer is:
meagre
'limited' is the definition.
'yours truly to changing gear' is the wordplay.
'yours truly' becomes 'me' ().
'to changing' indicates an anagram.
'gear' is an anagram of 'agre'.
'me'+'agre'='MEAGRE'
(Other definitions for meagre that I've seen before include "Stingy - thin" , "Lacking in quantity or quality" , "Thin or scanty" , "weak" , "Thin -- inadequate" .)