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One of the Germans' U-boats (3)

Ross

I believe the answer is:

sub

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'one' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'of the germans' u-boats' is the wordplay.
'of' indicates a hidden word.
'SUB' is hidden in the letters of 'germans u boats'.

Can you help me to learn more?

(Other definitions for sub that I've seen before include "Warship; membership fee" , "Junior editor" , "Prefix meaning beneath" , "Beneath on bus" , "Briefly, membership fee or stand-in" .)

I've seen this clue in the Evening Standard.
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