Joy of genealogy regularly recalled (4)
I believe the answer is:
glee
'joy' is the definition.
(I know that joy can be written as glee)
'genealogy regularly recalled' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'recalled' says the letters should be written in reverse (to recall can mean to bring something back).
The alternate letters of 'genealogy' are 'eelg'.
'eelg' written backwards gives 'GLEE'.
'of' is the link.
(Other definitions for glee that I've seen before include "Impish enjoyment" , "Elation" , "Mirth - part song for male voices" , "Great merriment" , "(Malicious) satisfaction" .)