Record points for weapon (4)
I believe the answer is:
epee
'for weapon' is the definition.
(epee is a kind of weapon)
'record points' is the wordplay.
'record' becomes 'EP' (abbreviation for extended play record).
'points' becomes 'ee' (an abbreviation for a compass point written twice).
'ep'+'ee'='EPEE'
(Other definitions for epee that I've seen before include "Fencing weapon" , "sharp-edged implement" , "piece of fencing" , "Bit of fencing" , "Fencing sword, heavier than a foil" .)