Popular expression around firm for a means of contacting others (8)
I believe the answer is:
intercom
'a means of contacting others' is the definition.
I can't tell whether this defines the answer.
'popular expression around firm' is the wordplay.
'popular' becomes 'in' (something that's 'in' is fashionable).
'expression' becomes 'term' (both can mean a piece of vocabulary).
'around' indicates putting letters inside.
'firm' becomes 'co' (abbreviation for company).
'term' going around 'co' is 'tercom'.
'in'+'tercom'='INTERCOM'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for intercom that I've seen before include "Device for two-way talking" , "communications system" , "Two-way speaking device" , "Means of transmitting messages" , "Speaker system" .)