Learning to protect single flower (5)
I believe the answer is:
loire
'flower' is the definition.
(Loire is an example)
'learning to protect single' is the wordplay.
'learning' becomes 'lore' (I've seen this before).
'to protect' indicates putting letters inside.
'single' becomes 'i' (one).
'lore' going around 'i' is 'LOIRE'.
(Other definitions for loire that I've seen before include "flower abroad" , "River flowing through Tours and Nantes" , "Current French" , "flower found amid vineyards" , "department in France" .)