Finish with the last tailless rodents prevalent in a certain area (7)
I believe the answer is:
endemic
'prevalent in a certain area' is the definition.
I can't judge whether this definition defines the answer.
'finish with the last tailless rodents' is the wordplay.
'finish' becomes 'end' (synonyms).
'with' says to put letters next to each other.
'last' says to take the final letters.
'tailless' means to remove the last letter (the tail of the word is removed).
'rodents' becomes 'mice' (mouse is a kind of rodent).
The final letter of 'the' is 'e'.
'mice' with its last letter taken away is 'mic'.
'end'+'e'+'mic'='ENDEMIC'
Can you help me to learn more?
(Other definitions for endemic that I've seen before include "Disease found locally" , "Widely prevalent" , "(Of a disease) regularly found in a certain area" , "Local (of disease)" , "(Of disease) widespread in an area" .)