Inexplicable sight of a famous restaurant literally empty (7)
I believe the answer is:
anomaly
'inexplicable sight' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'a famous restaurant literally empty' is the wordplay.
'famous restaurant' becomes 'noma' (I am not sure about this - if you are sure you should believe this answer much more).
'empty' means to remove the middle letters.
'literally' with its middle removed is 'ly'.
'a'+'noma'+'ly'='ANOMALY'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for anomaly that I've seen before include "There's curiosity" , "Inconsistency or deviation from general rule" , "Misfit - exception" , "Deviation from the norm or common" , "Something deviating from the usual" .)