Bosc or Bartlett (4)
I believe the answer is:
pear
This clue is a double definition.
'bosc' is the first definition.
(I've seen this in another clue)
'bartlett' is the second definition.
(I've seen this in another clue)
(Other definitions for pear that I've seen before include "Tasty fruit that tapers towards the stalk" , "Fruit; sounds like duo" , "Shapely fruit?" , "Source of cider" , "Conference, perhaps" .)