Mounties plan a descent – that includes waterside walks (10)
I believe the answer is:
esplanades
'waterside walks' is the definition.
'mounties plan a descent that includes' is the wordplay.
'that includes' indicates a hidden word.
'ESPLANADES' is hidden in the letters of 'mounties plan a descent'.
(Other definitions for esplanades that I've seen before include "go to seaside resorts for such" , "Places to stroll" , "Seafront walks" , "seaside walks" .)