Intend secret to be kept from family (7)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

(clan)DESTINE. Clan = family, and this took me a while to parse! Why does the word look so strange? Does anyone ever use it? As opposed to destined, which is common. We need a word to describe words only ever used in crosswords: cruciwords! is this a cruciverb? I daresay there are crucinouns, too..