Aim low (4)
I believe the answer is:
mean
This clue is a double definition.
'aim' is the first definition.
(I've seen this before)
'low' is the second definition.
(thesaurus)
(Other definitions for mean that I've seen before include "The average could be miserly" , "Signify; average" , "Mid-point" , "spell" , "Name for being tight-fisted" .)