His stocks are the kind people's legs fit into (6)
I believe the answer is:
hosier
'his stocks are the kind' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'people's legs fit into' is the wordplay.
I cannot really understand how this works, but
'people's' could be 'os' (O is an example) and 'os' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for hosier that I've seen before include "Seller of stockings etc" , "Shopkeeper who sells stockings" , "seller of 24 [NYLONS]" , "One sells socks and stockings" , "Manufacturer or seller of stockings" .)