The most common and most likely answer to this crossword clue is the 6 letter word BOUGHT
I've seen this crossword clue in Financial Times
B
O
U
G
H
T
Buddy explains!

The straight part
We know that "paid for" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case paid for = bought.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 BOUGHT mean?
BOUGHT verb- To obtain (something) in exchange for money or goods
- To obtain by some sacrifice.
- To bribe.
- To be equivalent to in value.
- To accept as true; to believe
- To make a purchase or purchases, to treat (for a meal)
- To make a bluff, usually a large one.
- A bend; flexure; curve; a hollow angle.
- A bend or hollow in a human or animal body.
- A curve or bend in a river, mountain chain, or other geographical feature.
- The part of a sling that contains the stone.
- A fold, bend, or coil in a tail, snake's body etc.