Butterfly operating when windy? (6-3)

I believe the answer is:

orange-tip

I'm a little stuck... Click here to teach me more about this clue!

'butterfly' is the definition.
(I've seen this before)

'operating when windy?' is the wordplay.
'operating' anagrams to 'ORANGE-TIP'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

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

I've seen this clue in The Telegraph.

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