Pleasant character of street going round small headland (9)
I believe the answer is:
sweetness
'pleasant character' is the definition.
(quality of being nice or pleasant)
'street going round small headland' is the wordplay.
'street' becomes 'st' (abbreviation).
'going round' is an insertion indicator (some letters go around others).
'small' becomes 'wee' (Scottish term for small).
'headland' becomes 'ness' (both can mean a promontory).
'st' placed around 'wee' is 'sweet'.
'sweet'+'ness'='SWEETNESS'
'of' is the link.
(Other definitions for sweetness that I've seen before include "Quality of sugar" , "appearing reasonable?" , "Fresh quality (of water); one with light" , "Amiability" , "Light accompaniment for this" .)