Send up Times campaign? (5)
I believe the answer is:
lobby
'campaign?' is the definition.
(as in lobbying for a political goal)
'send up times' is the wordplay.
'send up' becomes 'lob' (to lob is to throw something up into the air).
'times' becomes 'by' (both can mean 'multiplied by').
'lob'+'by'='LOBBY'
(Other definitions for lobby that I've seen before include "entrance-hall" , "invoking name of pressure group" , "Entrance room" , "Vestibule" , "Hallway; seek to influence" .)