Phone's picked up and put down (4)
I believe the answer is:
laid
'put down' is the definition.
(I've seen this before)
'phone's picked up' is the wordplay.
'phone' becomes 'dial' (dial phone is a kind of phone).
'picked up' says the letters should be written backwards.
'dial' backwards is 'LAID'.
'and' is the link.
(Other definitions for laid that I've seen before include "Placed horizontally on a surface" , "Doze" , "Wagered" , "Flattened by wind and rain" , "Put down like dial" .)