Fly's last to escape insectivore (5)
I believe the answer is:
shrew
'insectivore' is the definition.
(I know that shrew is a type of insectivore)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for shrew that I've seen before include "Small mouselike animal" , "Woman to be tamed?" , "Small insectivore" , "Insectivorous mammal" , "difficult woman" .)