Latest thing in trendiness (3)
I believe the answer is:
end
'latest thing' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'in trendiness' is the wordplay.
'in' indicates the answer is hidden within the clue.
'END' is hidden within 'trendiness'.
Can you help me to learn more?
(Other definitions for end that I've seen before include "Fine" , "Finish; goal" , "Conclusion or purpose" , "Bring to a conclusion" , "Bring to a close" .)