Second harbour's smoothed (6)

I believe the answer is:

shaven

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'smoothed' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?

'second harbour's' is the wordplay.
'second' becomes 's' (common abbreviation).
'harbour' becomes 'haven' (synonyms).
's'+'haven'='SHAVEN'

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(Other definitions for shaven that I've seen before include "lacking coverage" , "Without a beard" , "without locks" , "With hair removed (N, not D)" , "Hairless after work with razor" .)

I've seen this clue in The Daily Mail.

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