Crossword Genius

Additionally wide, say? (5)

Ross

I believe the answer is:

extra

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This clue could be a double definition.

'additionally' is the first definition.
(thesaurus)

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

Can you help me to learn more?

(Other definitions for extra that I've seen before include "unused" , "Bit-part actor" , "One has no lines" , "Bit part actor" , "additional supplies" .)

I've seen this clue in the Evening Standard.
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