Hanging about for work in restaurant (7)
I believe the answer is:
waiting
'hanging about' is the definition.
The answer and definition can be both to do with social activities as well as being present participle verbs.
Perhaps they are linked in a way I don't understand?
'work in restaurant' is the wordplay.
'work' becomes 'wait' (waiting is a kind of working).
'in restaurant' becomes 'ing' (I can't explain this - if you can you should give a lot more credence to this answer).
'wait'+'ing'='WAITING'
'for' is the link.
Can you help me to learn more?
(Other definitions for waiting that I've seen before include "Serving at table" , "holding back" .)