What Spitfire pilots used to do with eggs? (8)

I believe the answer is:

scramble

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'what spitfire pilots used to do with eggs?' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for scramble that I've seen before include "make a message unintelligible" , "climb over rocks" , "Motorbike rally" , "Make jumbled" , "Disorderly rush" .)

I've seen this clue in The Sun.

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