Such a blonde can be a darling (5)
I believe the answer is:
honey
'a darling' is the definition.
(I've seen this in another clue)
'such a blonde' is the wordplay.
I cannot quite see how this works, but
'a' could be 'one' and 'one' is found in the answer.
This explanation may well be incorrect...
'can be' is the link.
Can you help me to learn more?
(Other definitions for honey that I've seen before include "luvvie" , "sweetheart" , "Made by bees from nectar" , "Nectar product" , "Hive fluid" .)