Crossword Genius

He hawks round a bargain for motorists (9)

Ross

I believe the answer is:

cheapjack

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

'he hawks round a' is the definition.
The definition suggests a singular noun but the answer is not.

'bargain for motorists' is the wordplay.
'bargain' becomes 'cheap' (I've seen this before).
'for motorists' becomes 'jack' (I can't explain this - if you can you should believe this answer much more).
'cheap'+'jack'='CHEAPJACK'

Can you help me to learn more?

(Other definitions for cheapjack that I've seen before include "Poor" , "inferior quality" .)

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