The most common and most likely answer to this crossword clue is the 8 letter word PARLAYED
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More clues leading to the result PARLAYED
Buddy explains!

The straight part
We know that "exploited for gain" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case exploited for gain = parlayed.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PARLAYED mean?
PARLAYED verb- To carry forward the stake and winnings from a bet on to a subsequent wager or series of wagers.
- (by extension) To increase (an asset, money, etc.) by gambling or investing in a daring manner.
- (by extension, generally) To convert (a situation, thing, etc.) into something better.
- To have a discussion, especially one between enemies.