What's the point in documentary dismissing numeracy? (3)
I believe the answer is:
dot
'what's the point' is the definition.
('dot' can be a synonym of 'point')
'documentary dismissing numeracy?' is the wordplay.
'dismissing' suggests deleting specific letters.
'documentary' with 'numeracy' removed is 'DOT'.
'in' acts as a link.
(Other definitions for dot that I've seen before include "Long-ago year?" , "A point, small round mark" , "Tiny speck" , "Point; speck" , "Cotton, say" .)