Crossword Genius

In which soldiers sometimes take a dip? (6,3)

Ross

I believe the answer is:

boiled egg

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

This clue could be a double definition.

'in which soldiers sometimes' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'a dip?' is the second definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'take' acts as a link.

Can you help me to learn more?

(Another definition for boiled egg that I've seen is " It takes about 3 to 4 minutes".)

I've seen this clue in The Times.
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