Show emotion when old queen enters factory (7)
I believe the answer is:
cannery
'factory' is the definition.
(cannery is a kind of factory)
'show emotion when old queen enters' is the wordplay.
'show emotion' becomes 'cry'.
'when old queen' becomes 'anne' (I can't justify this - if you can you should give a lot more credence to this answer).
'enters' indicates putting letters inside.
'cry' placed around 'anne' is 'CANNERY'.
(Other definitions for cannery that I've seen before include "Food container factory" , "Row in Monterey" , "Factory filling tins" .)