It may force people into early retirement (6)
I believe the answer is:
curfew
'it may force people into early retirement' is the definition.
The definition suggests a singular noun which matches the answer.
'it may force' is the wordplay.
I cannot really understand how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is present in the answer.
'force' could be 'f' (symbol used in Physics e.g. f=ma) and 'f' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for curfew that I've seen before include "Night-time movement ban" , "Regulation restricting movement at night" , "Early indoors imposed by military" , "Order restricting movements after a set time" , "Restriction on nocturnal movement" .)