Crossword Genius

Undesirable trade for jam-maker? (7)

Ross

I believe the answer is:

traffic

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

This clue could be a double definition.

'undesirable trade' is the first definition.
'traffic' can be an answer for 'trade' (I've seen this before). I'm unsure of the 'undesirable' bit.

'jam-maker?' is the second definition.
(traffic can cause traffic jams)

'for' is the link.

Can you help me to learn more?

(Other definitions for traffic that I've seen before include "wheels?" , "Trade (in cars?)" , "Illegally push" , "Vehicles coming and going" , "Sort of light" .)

I've seen this clue in The Times.
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