Crossword Genius

Jars of wine on board (6)

Ross

I believe the answer is:

shocks

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Globe and Mail and The Guardian.
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