Crossword Genius

Baby found in the doorway? (7)

Ross

I believe the answer is:

stepson

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'baby' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'doorway?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'found in the' is the link.

Can you help me to learn more?

(Other definitions for stepson that I've seen before include "second family member" , "younger member of family" , "underfoot?" , "Tramples (5,2) -- relative" , "Male offspring of partner's former marriage" .)

I've seen this clue in the Evening Standard.
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