Post odd letters from people with energy (4)
I believe the answer is:
pole
'post odd letters' is the definition.
'pole' can be an answer for 'post' (I've seen this in other clues). I am not sure about the 'odd letters' bit.
'people with energy' is the wordplay.
'people with' becomes 'pol' (I can't justify this - if you can you should believe this answer much more).
'energy' becomes 'e' (physics symbol as in E=mco).
'pol'+'e'='POLE'
'from' is the link.
Can you help me to learn more?
(Other definitions for pole that I've seen before include "Round rod of wood or metal" , "Native of Warsaw" , "Long, round rod" , "(or north or eouth?)" , "European; measure of length" .)