Do come up with our bouquet (5)
I believe the answer is:
odour
'bouquet' is the definition.
(I've seen this before)
'do come up with our' is the wordplay.
'do come' becomes 'do' ('do' can be a synonym of 'come').
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'with' says to put letters next to each other.
'do' back-to-front is 'od'.
'od'+'our'='ODOUR'
(Other definitions for odour that I've seen before include "Aroma, smell" , "A smell, good or bad" , "Olfactory sensation" , "Smell, scent" , "Bouquet" .)