"The Little Mermaid" mermaid (5)
I believe the answer is:
ariel
'the little mermaid mermaid' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ariel that I've seen before include "Fairy in "The Tempest"" , "role in Shakespeare" , "Swallows" , "Angel" , "29 9 [TEMPEST CHARACTER]" .)