Crossword Genius

Opened a couple of letters to read (6)

Ross

I believe the answer is:

spread

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'opened' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I don't see?

'a couple of letters to read' is the wordplay.
'a couple of letters' can mean two replacements for 'letter'.
'letter' becomes 's'.
'letter' becomes 'p' ().
'to' is a charade indicator (letters next to each other).
's'+'p'+'read'='SPREAD'

Can you help me to learn more?

(Other definitions for spread that I've seen before include "we hope to avoid in middle age" , "butter?" , "Generous meal" , "Scatter around" , "Extend - banquet" .)

I've seen this clue in the Evening Standard.
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