Son meeting father in spring (3)
I believe the answer is:
spa
'spring' is the definition.
(thesaurus)
'son meeting father' is the wordplay.
'son' becomes 's'.
'meeting' says to put letters next to each other.
'father' becomes 'pa' (pa is a kind of father).
's'+'pa'='SPA'
'in' acts as a link.
(Other definitions for spa that I've seen before include "town for his health!" , "A curative mineral spring, or place with one" , "Water-cure town" , "place of treatment" , "Water source" .)