Nice days, clinching return of desire for outings (8)
I believe the answer is:
journeys
'outings' is the definition.
(an outing is a journey somewhere)
'nice days clinching return of desire' is the wordplay.
'nice days' becomes 'jours' ('days' in French - eg in Nice).
'clinching' is an insertion indicator.
'return of' says the letters should be written in reverse.
'desire' becomes 'yen' (yen can mean a longing or desire).
'yen' reversed gives 'ney'.
'jours' going around 'ney' is 'JOURNEYS'.
'for' is the link.
(Other definitions for journeys that I've seen before include "Trips, expeditions" , "Travels from place to place" .)