Once more lacking in range (3)
I believe the answer is:
aga
'range' is the definition.
(I've seen this before)
'once more lacking in' is the wordplay.
'once more' becomes 'again' ('again' can be a synonym of 'once more').
'lacking' indicates named letters should be taken away.
'again' with 'in' taken away is 'AGA'.
(Other definitions for aga that I've seen before include "Proprietary name for a domestic stove" , "Eastern leader" , "--- Khan, spiritual head of Ismaili Muslims" , "Turkish leader" , "Foreign ruler" .)