Apply water to cut flowers (5)
I believe the answer is:
spray
'apply water' is the definition.
I can't tell whether this definition defines the answer.
'cut flowers' is the wordplay.
'cut' means to remove the last letter.
'flowers' becomes 'sprays' (I've seen this before).
'sprays' with its final letter removed is 'SPRAY'.
'to' is the link.
(Other definitions for spray that I've seen before include "Sprinkle water on - a small bouquet" , "Cloud of flying droplets" , "Finely sprinkle" , "Drench" , "Aerosol efflux" .)