Rob worked around first restaurant (6)
I believe the answer is:
bistro
'restaurant' is the definition.
(bistro is a kind of restaurant)
'rob worked around first' is the wordplay.
'worked' indicates an anagram.
'around' means one lot of letters goes inside another.
'first' becomes 'ist' (**).
'rob' anagrammed gives 'bro'.
'bro' going around 'ist' is 'BISTRO'.
(Other definitions for bistro that I've seen before include "Small inexpensive eatery" , "Cheap restaurant" , "Little restaurant" , "Cafe/restaurant" , "'Small, inexpensive restaurant (6)'" .)