Pain of bachelordom (4)
I believe the answer is:
ache
'pain' is the definition.
(ache is a kind of pain)
'of bachelordom' is the wordplay.
'of' says the answer is hidden in the clue.
'ACHE' can be found hidden inside 'bachelordom'.
(Other definitions for ache that I've seen before include "painful" , "Throb - hurt" , "Continuous hurt" , "anguish" , "Similar" .)