use Module qw(somesub);

##</code><code>##

BEGIN {
   require Module;
   Module->import('somesub') if Module->can('import');
}

##</code><code>##

<%once>
# warn("once: " . __PACKAGE__ . "\n");

require Module;
# or:      use Module ();
# but not: use Module;
# An empty list disables import,
# but ommiting the list does not.
</%once>
...
...
...
<%init>
# warn("init: " . __PACKAGE__ . "\n");

Module->import(qw(somesub));

... &somesub(xxx);

</%init>