Record the cost of call (4,2)
I believe the answer is:
ring up
This clue might be a double definition.
'record' is the first definition.
(I know that ring up is a kind of record)
'cost of call' is the second definition.
'ring up' can be an answer for 'call' (call on the phone). I am not certain of the 'cost of' bit.
'the' is the link.
Can you help me to learn more?
(Other definitions for ring up that I've seen before include "Telephone someone or record on cash register" , "Contact by phone" , "Try to contact" .)