Crossword Genius

Puts classification on return of proposed defence system (3)

Ross

I believe the answer is:

ids

'puts' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

I can't explain the remainder of the clue.

(Other definitions for ids that I've seen before include "Tory" , "Cards to identify the bearers, initially" .)

I've seen this clue in The Times.
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