CLICKET
Etymology 1
Verb
clicket (third-person singular simple present clickets, present participle (US) clicketing or (UK) clicketting, simple past and past participle (US) clicketed or (UK) clicketted)
(intransitive, of a fox or foxes) To be in oestrus; to copulate.
Etymology 2
Noun
clicket (plural clickets)
(UK, dialect) The knocker of a door.
(UK, dialect) A latchkey.
He carried always the small silver clicket
With which, as pleased him, he'd unlock the gate.
Source: Wiktionary
Click"et, n. Etym: [OF. cliquet the latch of a door. See 5th Click.]
1. The knocker of a door. [Prov. Eng.]
2. A latch key. [Eng.] Chaucer.
Source: Webster’s Unabridged Dictionary 1913 Edition