Call to say the toll is greater? (4,2)
I believe the answer is:
ring up
'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" .)