Lend a car out for a period of twelve months (8)
I believe the answer is:
calendar
'period of twelve months' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'lend a car out' is the wordplay.
'out' indicates putting letters inside.
'lend'+'a'='lenda'
'lenda' put inside 'car' is 'CALENDAR'.
'for a' acts as a link.
Can you help me to learn more?
(Other definitions for calendar that I've seen before include "List of dates of land race" , "Tabular array of days" , "list of appointments" , "that's dated" , "Day/month chart" .)