Williams seems to be in heaven usually! (5)
I believe the answer is:
venus
'williams' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?
'to be in heaven usually' is the wordplay.
'to be in' indicates a hidden word.
'VENUS' is hidden in the letters of 'heaven usually'.
'seems' acts as a link.
Can you help me to learn more?
(Other definitions for venus that I've seen before include "Morning star" , "Brightest planet" , "our Neighbour" , "Solar system planet" , "Roman goddess of love" .)