Drunks consuming port with his specious old teachers (8)
I believe the answer is:
sophists
'specious old teachers' is the definition.
'sophists' can be an answer for 'teachers' (I've seen this before). I am not certain of the 'specious old' bit.
'drunks consuming port with his' is the wordplay.
'drunks' becomes 'sots' ('sot' can be a synonym of 'drunk'**).
'consuming' means one lot of letters goes inside another.
'port' becomes 'p'.
'with' means one lot of letters go next to another.
'p'+'his'='phis'
'sots' enclosing 'phis' is 'SOPHISTS'.
Can you help me to learn more?
(Other definitions for sophists that I've seen before include "They use subtle but misleading reasoning" , "teachers" .)