Point weapon? That's harsh! (8)
I believe the answer is:
strident
'harsh' is the definition.
(I've seen this before)
'point weapon?' is the wordplay.
'point' becomes 'S' (S is an example).
'weapon?' becomes 'trident' (trident is a kind of weapon).
's'+'trident'='STRIDENT'
'that's' acts as a link.
(Other definitions for strident that I've seen before include "(Of a voice) loud and grating" , "Noisy" , "Loud and harsh over tridents" , "harsh sound" , "Roaring" .)