Careless local name dropping causes evacuation (8)
I believe the answer is:
laxative
'evacuation' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'careless local name dropping' is the wordplay.
I cannot quite see how this works, but
'careless' could be 'lax' (synonyms) and 'lax' is present in the answer.
'name' could be 'ive' and 'ive' is found within the answer.
The remaining letters 'at' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'causes' acts as a link.
Can you help me to learn more?
(Other definitions for laxative that I've seen before include "Purgative, loosener" , "Medicine for constipation" , "Aperient medicine" .)