Uses a needle at four points (4)
I believe the answer is:
sews
'uses a needle' is the definition.
(I've seen this in another clue)
'four points' is the wordplay.
'four' becomes 'se' (I can't explain this - if you can you should believe this answer much more).
'points' becomes 'Ws' (W is an example).
'se'+'ws'='SEWS'
'at' acts as a link.
Can you help me to learn more?
(Other definitions for sews that I've seen before include "Does needlework" , "Stitches" , "Works with needle and thread" , "Uses needle and thread" .)