sub routine string call

Probly easy answer but im looking for a way to call a sub out of a string into play after building it in the string dynamically. basically:
sub basesub {
...
return @somearray;
}

my secondsub {
my $str = "&basesub";
my @returnarray = $str;
print(@returnarray);
}

i cant for the life of me find the method to call the subroutine out of the str back into play as a true sub.