Called in, are to make the plans (7)
I believe the answer is:
arrange
'make the plans' is the definition.
'arrange' can be an answer for 'make' (thesaurus). I'm not sure about the 'the plans' bit.
'called in are' is the wordplay.
'called' becomes 'rang' (called on the phone).
'in' is an insertion indicator.
'rang' put into 'are' is 'ARRANGE'.
'to' is the link.
Can you help me to learn more?
(Other definitions for arrange that I've seen before include "Put in order; plan" , "Put into a proper order" , "Sort" , "Put in order - organise" , "Marshal" .)