Diana could be a nymph (5)

I believe the answer is:

naiad

'a nymph' is the definition.
(I know that naiad is a type of Greek nymph)

'diana could be' is the wordplay.
'could be' is an anagram indicator.
'diana' with letters rearranged gives 'NAIAD'.

(Other definitions for naiad that I've seen before include "Aquatic larva of a dragonfly" , "watery spirit" , "spirit in water" , "Fabulous spring being" , "River nymph" .)

I've seen this clue in The Irish News.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.