Smooth Conservative reclines in front of harbour (5-6)
I believe the answer is:
'smooth' is the definition.
'conservative reclines in front of harbour' is the wordplay.
'conservative' becomes 'C' (UK political abbreviation).
'reclines' becomes 'leans' (I can't justify this - if you can you should believe this answer much more).
'in front of' is a charade indicator (letters next to each other).
'harbour' becomes 'haven' (synonyms).
Can you help me to learn more?
(Another definition for clean-shaven that I've seen is " Unbearded".)