Have you just tried it? What error do you get?

In short, there's no problem with modules using one another (as per your description):

package A;

use C;

sub new {
    return bless {}, $_[0];
}

sub execute {
    print "A::execute()\n";
}

sub getCSVHandle {
    my $c = C->new();
    return $c;
}

1;

-----

package C;

use A;

sub new {
    return bless {}, $_[0];
}

sub munge {
    my $a = A->new();
    $a->execute();
}

1;

-----

#!/usr/bin/perl

use A;

my $a = A->new();
my $c = $a->getCSVHandle();
$c->munge();    # prints "A::execute()"
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