Wine inside ship's jars (6)
I believe the answer is:
shocks
'jars' is the definition.
(I've seen this before)
'wine inside ship's' is the wordplay.
'wine' becomes 'hock' (type of wine).
'inside' is an insertion indicator.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'hock' going into 'ss' is 'SHOCKS'.
(Other definitions for shocks that I've seen before include "Appals" , "Sudden upsetting or surprising events" , "'Stuns, jolts (6)'" , "Surprises, sometimes electrical" , "Effects of charges of electricity" .)