Crossword Genius

Delay follows parking jam (8)

Ross

I believe the answer is:

preserve

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

'jam' is the definition.
(jam is a type of preserve)

'delay follows parking' is the wordplay.
I cannot quite see how this works, but
'parking' could be 'p' (abbreviation on road signs) and 'p' is present in the answer.
The remaining letters 'reserve' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for preserve that I've seen before include "Prevent from deteriorating" , "Maintain; keep safe" , "kipper?" , "Jam or marmalade" , "Maintain in unaltered condition" .)

I've seen this clue in The Telegraph.
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