The Potential of Being a Would-Be Singer

"Would-be" is an adjective used to describe someone or something that has the potential or intention to do something, but has not yet achieved it. It can also be used to describe someone who lacks experience or expertise in a particular area.

For example:

* "He's a would-be novelist, but he's never finished anything." (meaning he has the intention to write novels, but has not yet done so)
* "She's a would-be chef, but she's never worked in a real kitchen." (meaning she has the intention to be a chef, but lacks experience)

In your sentence, "would-be" is used to describe the person who has the intention to do something, but has not yet achieved it. In this case, the person has the intention to be a professional singer, but they have not yet succeeded in doing so.