File about metropolis brings joy (8)
I believe the answer is:
felicity
'joy' is the definition.
(I've seen this before)
'file about metropolis' is the wordplay.
'about' indicates an anagram.
'metropolis' becomes 'city' (a metropolis is a large city).
'file' is an anagram of 'feli'.
'feli'+'city'='FELICITY'
'brings' acts as a link.
(Other definitions for felicity that I've seen before include "happy event" , "Intense joy" , "Girl" , "Joy -- eloquence" , "Complete happiness" .)