A month in Capri? Lovely! (5)
I believe the answer is:
april
'a month' is the definition.
(April is an example)
'in capri? lovely' is the wordplay.
'in' indicates a hidden word.
'APRIL' can be found hidden inside 'capri lovely'.
(Other definitions for april that I've seen before include "whose first date is foolish?" , "time of the year" , "Spring month" , "Girl" , "Eliot's 'cruellest month'" .)