Crossword Genius

Call to say the toll is greater? (4,2)

Ross

I believe the answer is:

ring up

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'call' is the definition.
(thesaurus)

'the toll is greater?' is the wordplay.
'the toll' becomes 'ring' (I've seen this before).
'is greater?' becomes 'up' (I can't justify this - if you can you should give a lot more credence to this answer).
'ring'+'up'='RING UP'

'to say' is the link.

Can you help me to learn more?

(Other definitions for ring up that I've seen before include "Try to contact" , "Contact by phone" , "Telephone someone or record on cash register" .)

I've seen this clue in the Evening Standard.
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