Marshal called in live (7)
I believe the answer is:
arrange
'marshal' is the definition.
(I know that marshal is a more specific form of arrange)
'called in live' is the wordplay.
'called' becomes 'rang' (called on the phone).
'in' means one lot of letters goes inside another.
'live' becomes 'are' ('they live' means 'they are').
'rang' inserted into 'are' is 'ARRANGE'.
(Other definitions for arrange that I've seen before include "Put in neat order" , "Place in order" , "Fix" , "Rare nag (anag.)" , "Put in order - organise" .)