One may be of interest to a lepidopterist operating abroad (6-3)

I believe the answer is:

orange-tip

'one may be of interest to a lepidopterist' is the definition.
(orange-tip is a type of butterfly)

'operating abroad' is the wordplay.
'abroad' indicates anagramming the letters.
'operating' is an anagram of 'ORANGE-TIP'.

(Other definitions for orange-tip that I've seen before include "Butterfly variety" , "British butterfly" , "Common butterfly" .)

I've seen this clue in The Telegraph.

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.