Pole teacher who handles letters (10)
I believe the answer is:
postmaster
'pole teacher who handles letters' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'pole teacher' is the wordplay.
'pole' becomes 'post' (I've seen this before).
'teacher' becomes 'master' (I've seen this before).
'post'+'master'='POSTMASTER'
Can you help me to learn more?
(Other definitions for postmaster that I've seen before include "Mail chief" , "who runs a local office?" .)