Narrow focus of animal sanctuary - mostly mustelidae (4,2)

I believe the answer is:
zoom in
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Another definition for zoom in that I've seen is " Focus more closely".)
I've seen this clue in The Independent.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.

Connecting...