Singular dad's resort (3)
I believe the answer is:
spa
'resort' is the definition.
(spa is a kind of resort)
'singular dad's' is the wordplay.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'dad' becomes 'pa' (both can mean one's father).
's'+'pa'='SPA'
(Other definitions for spa that I've seen before include "here for healthy holiday" , "place of treatment" , "Cheltenham or Bath?" , "where health benefits are offered" , "Watering-place" .)