Stands regularly on head, causing pain (7)
I believe the answer is:
sadness
'pain' is the definition.
(thesaurus)
'stands regularly on head' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'on' means one lot of letters go next to another.
'head' becomes 'ness' (ness is a headland**).
The alternating letters of 'stands' are 'sad'.
'sad'+'ness'='SADNESS'
'causing' acts as a link.
(Other definitions for sadness that I've seen before include "Dolour" , "Sorrow, unhappiness" , "Dejection" , "blues" , "Misery" .)