How to run a subcommand inside find exec

How can I run a subcommand inside find's exec? For example, if I want to get the filename only from the full path and print it, I would fire,

find ./ -name "*.csv" -exec echo $(basename {}) \;

where the echo is parent command of child command basename.

But the result is same as this,

find ./ -name "*.csv" -exec echo {} \;

What should I do ?