Some nurses plan a demo walk (9)
I believe the answer is:
esplanade
'walk' is the definition.
(I know that esplanade is a type of Promenade)
'some nurses plan a demo' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ESPLANADE' is hidden within 'nurses plan a demo'.
(Other definitions for esplanade that I've seen before include "Seafront walkway" , "Level seashore walkway" , "Sea-front drive" , "Long stretch of open seafront for walking or driving" , "prom" .)