Crossword Genius

Blocks, last couple of five digits (6)

Ross

I believe the answer is:

vetoes

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

'blocks last couple' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their -s form.
Perhaps you can see an association between them that I can't see?

'five digits' is the wordplay.
'five' becomes 've' (I am not sure about this - if you are sure you should believe this answer much more).
'digits' becomes 'toes' (toe is a kind of digit).
've'+'toes'='VETOES'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for vetoes that I've seen before include "Votes to block a decision" , "E votes to block decisions" , "Casts over-riding negative vote" , "Refuses to allow" .)

I've seen this clue in The Guardian.
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