Enliven flustered old head nurse regarding surroundings (13)
I believe the answer is:
environmental
'enliven flustered old head nurse regarding' is the definition.
I can't judge whether this definition defines the answer.
'surroundings' is the wordplay.
I cannot really see how this works, but
'surroundings' could be 'environment' (synonyms) and 'environment' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for environmental that I've seen before include "To do with one's surroundings" , "Green" , "Pertaining to the surrounding world" .)