Something pointed it's possible to read about a horse (6)
I believe the answer is:
dagger
'something pointed it's possible' is the definition.
I can't tell whether this defines the answer.
'read about a horse' is the wordplay.
'read' becomes 'der' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' is an insertion indicator.
'horse' becomes 'gg' (geegee or GG is a childish term for a horse).
'a'+'gg'='agg'
'der' placed around 'agg' is 'DAGGER'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for dagger that I've seen before include "A weapon; a reference mark" , "''Is this a ... which I see before me'' (Macbeth)" , "The weapon Macbeth thought he saw" , "Stabbing weapon" , "Short knife for stabbing" .)