One foreign politician in Cork is crystal clear (6)
I believe the answer is:
limpid
'crystal clear' is the definition.
(thesaurus)
'one foreign politician in cork' is the wordplay.
I cannot really see how this works, but
'one' could be 'li' (I've seen this in other clues) and 'li' is present in the answer.
'politician' could be 'mp' and 'mp' is found within the answer.
The remaining letters 'id' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for limpid that I've seen before include "Completely clear" , "Calm" , "Clear - tranquil" , "Clear (writing, water)" , "Crystal-clear" .)