Love in the morning for us (5)
I believe the answer is:
amour
'love' is the definition.
('love' in French)
'morning for us' is the wordplay.
'morning' becomes 'am' (as in 12:00 AM).
'for us' becomes 'our' ('our' means belonging to us).
'am'+'our'='AMOUR'
'in the' acts as a link.
(Other definitions for amour that I've seen before include "Love-affair" , "Romantic affair" , "French romance" , "illicit liaison" , "20 [AFFAIR]" .)