Vessel in difficulty due to a jolt? (6)

I believe the answer is:

jamjar

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'vessel' is the definition.
(jamjar is a kind of vessel)

'difficulty due to a jolt?' is the wordplay.
'difficulty due' becomes 'jam' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to a jolt?' becomes 'jar' (synonyms).
'jam'+'jar'='JAMJAR'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for jamjar that I've seen before include "Container for conserve" , "London Transport?" , "Vessel" , "Container for preserve" , "Glass container" .)

I've seen this clue in the Evening Standard.

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