Crossword Genius

Soccer teams in the market for a left-winger (7)

Ross

I believe the answer is:

marxist

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

'a left-winger' is the definition.
(Marxist is an example)

'soccer teams in the market' is the wordplay.
'soccer teams' becomes 'xis' (I can't justify this - if you can you should believe this answer much more).
'in the' is an insertion indicator.
'market' becomes 'mart' (synonyms).
'xis' inserted within 'mart' is 'MARXIST'.

'for' is the link.

Can you help me to learn more?

(Other definitions for marxist that I've seen before include "Red" , "Type of communist" , "left-winger" , "A leftie once" , "Revolutionary" .)

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