Crossword Genius

The preserve of the motorist? (7,3)

Ross

I believe the answer is:

traffic jam

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

'the motorist?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'the preserve' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
'preserve' could be 'jam' (jam is a kind of preserve) and 'jam' is present in the answer.
This explanation may well be incorrect...

'of' acts as a link.

Can you help me to learn more?

(Other definitions for traffic jam that I've seen before include "Gridlock" , "Bottleneck on wheels" , "Problem, in a way" , "could make driver late" , "stuck in this" .)

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