Open bar to begin with for most of staff in small restaurant (6)
I believe the answer is:
bistro
'small restaurant' is the definition.
(I've seen this before)
'open bar to begin with for most of staff' is the wordplay.
'open bar' becomes 'bis' (I can't justify this - if you can you should give a lot more credence to this answer).
'begin with' suggests taking the first letters.
'for' is a charade indicator (letters next to each other).
'most of' means to remove the last letter.
'staff' becomes 'rod' (I've seen this before).
The initial letter of 'to' is 't'.
'rod' with its final letter removed is 'ro'.
'bis'+'t'+'ro'='BISTRO'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for bistro that I've seen before include "Cheap restaurant" , "Little restaurant" , "Coming out of restaurant" , "family concern perhaps" , "Small informal French restaurant" .)