Flag for junior officer (6)

I believe the answer is:

ensign

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This could be a double definition.

'flag for junior' is the first definition.
'ensign' can be an answer for 'flag' (I've seen this before). I'm unsure of the 'for junior' bit.

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

Can you help me to learn more?

(Other definitions for ensign that I've seen before include "Look upon with contempt" , "US naval rank" , "Commissioned rank in some navies" , "Flying" , "Lowly naval officer" .)

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