It's posh abroad, one argues (7)
I believe the answer is:
sophist
'one argues' is the definition.
I can't tell whether this defines the answer.
'it's posh abroad' is the wordplay.
'abroad' indicates an anagram (letters move around or go abroad).
'its'+'posh'='itsposh'
'itsposh' anagrammed gives 'SOPHIST'.
Can you help me to learn more?
(Other definitions for sophist that I've seen before include "One who uses clever but false argument" , "one might plausibly argue" , "Clever but fallacious reasoner" , "One using clever but wrong arguments" , "One given to specious reasoning" .)