Worry about fate of the oldest profession (8)
I believe the answer is:
harlotry
'the oldest profession' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'worry about fate' is the wordplay.
'worry' becomes 'harry' (I am not sure about this - if you are sure you should believe this answer much more).
'about' is an insertion indicator.
'fate' becomes 'lot' (synonyms).
'harry' placed around 'lot' is 'HARLOTRY'.
'of' is the link.
Can you help me to learn more?
(Other definitions for harlotry that I've seen before include "Prostitution" , "sexual activity" , "promiscuous activity" .)