What does the cryptic crossword clue "Profit or thing, say, with it to support 50% of commercial exchange (6)" mean?

The wordplay uses a charade (building blocks). MAR (synonym="MAR") + GIN (synonym="a thing served with it, as in the drink “gin and It”, where It is short for Italian Vermouth") = MARGIN The answer is MARGIN.

Profit or thing, say, with it to support 50% of commercial exchange (6)

Guardian Cryptic #29546 | 8 Down | 2024-11-21 flower

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