Learn from a hotheaded listener (4)

I believe the answer is:
hear
'learn' is the definition.
(synonyms)
'a hotheaded listener' is the wordplay.
'a hotheaded' becomes 'h' (this could be a standard abbreviation of which I'm unaware).
'listener' becomes 'ear' (body part which hears or listens).
'h'+'ear'='HEAR'
'from' is the link.
Can you help me to learn more?
(Other definitions for hear that I've seen before include "attend" , "Find out" , "learn" , "Try (in court)" , "Perceive aurally" .)
