Celebrity chef knocked over everything, for example, outside inn (7)
I believe the answer is:
nigella
'celebrity chef' is the definition.
(TV chef Nigella Lawson)
'knocked over everything for example outside inn' is the wordplay.
'knocked over' says the letters should be written backwards.
'everything' becomes 'all' (all things).
'for example' becomes 'e.g.' (short for 'exempli gratia', 'for example' in Latin).
'outside inn' becomes 'in' (I am not sure about this - if you are sure you should believe this answer much more).
'all'+'eg'+'in'='allegin'
'allegin' backwards is 'NIGELLA'.
Can you help me to learn more?
(Other definitions for nigella that I've seen before include "Love-in-a-mist genus - celebrity cook" , "Flower found in legal" , "Flower and tv cook" , "TV personality" , "Flower and TV chef" .)