Telephone (4)
(Other definitions for call up that I've seen before include "compulsory service" , "Remember" , "Order to report for military duty" , "Summons to serve in the armed forces" , "Evoke memories" .)
(Other definitions for ring that I've seen before include "Group operating illegally < call" , "Telephone - as bells do" , "Arena; jewellery item" , "Piece of jewellery" , "Wedding band" .)
'telephone' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for blower that I've seen before include "Speaking-tube" , "Fan; telephone (colloq.)" , "One producing current" , "Telephone (informal)" , "It produces an air blast" .)