The most common and most likely answer to this crossword clue is the 6 letter word GIGOLO
I've seen this crossword clue in The Guardian
G
I
G
O
L
O
More clues leading to the result GIGOLO
- Escort impressed American, old record being brought up
- Escort vessel taking line through ducks
- Carriage wheels broken by learner in Escort
- Male paid by performance, not at first unaccompanied
- Perform unaccompanied, soprano having left for dancing partner
- Escort boat taking line between ducks
- Joe’s old diary turned up in Playboy for cash
- Kept lover‘s ring, see, after performance
- Escort’s performance at technological centre
- Musical performance by unaccompanied topless escort
Buddy explains!

The straight part
We know that "boy for cash" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case boy for cash = gigolo.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 GIGOLO mean?
GIGOLO noun- A man who has a sexual relationship with a woman from whom he receives payment.
- A hired escort or dancing partner for a woman.