Aim for the head (5)
I believe the answer is:
point
This clue is a double definition.
'aim' is the first definition.
(I know that aim can be written as point)
'the head' is the second definition.
(synonyms)
'for' acts as a link.
(Other definitions for point that I've seen before include "Aim; sharp end" , "Indicate - purpose" , "Tip; aim" , "Tiny mark" , "Juncture" .)