Double issue? (5)

I believe the answer is:

twins

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'double issue?' is the definition.
Although both the answer and 'issue?' are nouns, they are not in the same form of the noun.

'double issue?' is the wordplay.
'double' becomes 'twin' (I've seen this before).
'issue?' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'twin'+'s'='TWINS'

Can you help me to learn more?

(Other definitions for twins that I've seen before include "Sign" , "Two offspring born at the same time to the same mother" , "Two born together" , "Matching pairs" , "Gemini" .)

I've seen this clue in The Sun.

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