Help by expert within easy reach (9)
I believe the answer is:
available
'within easy reach' is the definition.
The answer and definition are not the same part of speech.
'help by expert' is the wordplay.
'help' becomes 'avail' (availing is a kind of helping).
'by' means one lot of letters go next to another.
'expert' becomes 'able' (able can mean expert or talented).
'avail'+'able'='AVAILABLE'
Can you help me to learn more?
(Other definitions for available that I've seen before include "Can be had or obtained, in stock" , "on tap" , "Free; within reach" , "To hand" , "Uncommitted" .)