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Iron-clad soldiers go in force and open market (4,10)

Ross

I believe the answer is:

free enterprise

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'open market' is the definition.
(economic term)

'iron-clad soldiers go in force' is the wordplay.
'iron clad soldiers' becomes 'free' (I can't justify this - if you can you should give a lot more credence to this answer).
'go in' becomes 'enter' (synonyms).
'force' becomes 'prise' (I've seen this in other clues).
'free'+'enter'+'prise'='FREE-ENTERPRISE'

'and' is the link.

Can you help me to learn more?

(Other definitions for free enterprise that I've seen before include "capitalist system" , "Economic system" .)

I've seen this clue in The Telegraph.
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