Jars of wine on board (6)
I believe the answer is:
shocks
'jars' is the definition.
(I know this)
'wine on board' is the wordplay.
I cannot quite see how this works, but
'wine' could be 'hock' (hock is a kind of wine) and 'hock' is present in the answer.
'on board' could be 'ss' (I've seen this in other clues) and 'ss' is found in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for shocks that I've seen before include "Effects of charges of electricity" , "Surprises, sometimes electrical" , "Sudden upsetting or surprising events" , "'Stuns, jolts (6)'" , "Jolts, jars" .)