Word after head or heart (4)
I believe the answer is:
ache
'word after head or heart' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ache that I've seen before include "Pine" , "Feel sore" , "Dull throbbing pain" , "Each (anag.)" , "Throb - hurt" .)