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They also multiply naturally (6)

Ross

I believe the answer is:

adders

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'they' is the definition.
Both the definition and answer are plural nouns.
Perhaps you can see a link between them that I can't see?

'also multiply naturally' is the wordplay.
'also' becomes 'add' (I've seen this before).
'multiply naturally' becomes 'ers' (I can't explain this - if you can you should give a lot more credence to this answer).
'add'+'ers'='ADDERS'

Can you help me to learn more?

(Other definitions for adders that I've seen before include "Do they deal with tots" , "sum? We do" , "Sadder with snakes" , "Mathematical snakes" , "Totting 25 down?" .)

I've seen this clue in The Globe and Mail.
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