Not leaving work behind, in a manner of speaking? (7,4)
I believe the answer is:
talking shop
'behind in a manner of speaking?' is the definition.
I can't judge whether this defines the answer.
'not leaving work' is the wordplay.
'not leaving' becomes 'talking' (I can't justify this - if you can you should give a lot more credence to this answer).
'work' becomes 'shop' (shop is a kind of work).
'talking'+'shop'='TALKING SHOP'
(Other definitions for talking shop that I've seen before include "where nothing gets done?" , "discussing business after hours" , "place for discussion?" , "Parliament perhaps?" , "Useless committee" .)