The advice whenever I was clerk was to stay well out of it! Our local elections office make it quite clear to candidates that they must deliver their papers personally as they are checked while you wait and any corrections needed can be made immediately.
In an official capacity, clerks should be advising what can and can't be done during the period immediately preceding an election. So, for example, the general advice is for things like newsletters shouldn't be issued as it might be deemed to be promoting a particular candidate or group of candidates. Council property (photocopiers, printers etc.) can't be used for material promoting any candidate for example so the clerk shouldn't be printing and/or distributing any election material for any particular candidate.