Smoker with pipe had briefly repelled posh lass? (9)
I believe the answer is:
debutante
'posh lass?' is the definition.
(young girl debuting in upper-class society)
'smoker with pipe had briefly repelled' is the wordplay.
'smoker' becomes 'etna' (volcano Mount Etna, something which 'smokes').
'with' is a charade indicator (letters next to each other).
'pipe' becomes 'tube' (synonyms).
'had briefly' becomes 'd' (d is a shortened version of had - e.g. 'she'd').
'repelled' shows that the letters should be reversed in order.
'etna'+'tube'+'d'='etnatubed'
'etnatubed' reversed gives 'DEBUTANTE'.
(Other definitions for debutante that I've seen before include "one about to come out" , "One entering society for the first time" , "Young lady making her first appearance in society" , "young lady coming out" , "girl coming out" .)