Work old German money into teen fashion. It's free enterprise! (4,6)
I believe the answer is:
open market
'free enterprise' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?
'work old german money into teen fashion' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'old german money' becomes 'mark' (I've seen this in another clue).
'into' means one lot of letters goes inside another.
'fashion' is an anagram indicator.
'teen' anagrammed gives 'enet'.
'mark' going into 'enet' is 'enmarket'.
'op'+'enmarket'='OPEN MARKET'
'it's' is the link.
Can you help me to learn more?
(Another definition for open market that I've seen is " Kind of trade".)