With tips to swap, might cross hospital lounge? (3,4)
I believe the answer is:
day room
'with tips to swap might cross' is the definition.
I can't judge whether this defines the answer.
'hospital lounge?' is the wordplay.
'hospital' becomes 'day' (I can't justify this - if you can you should believe this answer much more).
'lounge?' becomes 'room' (lounge is a kind of room).
'day'+'room'='DAY ROOM'
Can you help me to learn more?
(Other definitions for day room that I've seen before include "Communal space for socialising at an institution" , "Communal hospital space" .)