Campaign (5)
'campaign' is the definition.
(as in lobbying for a political goal)
This is all the clue.
(Other definitions for lobby that I've seen before include "Seek to influence (a legislator)" , "Solicit" , "Shy" , "invoking name of pressure group" , "Small hall" .)
'campaign' is the definition.
(drive can mean a campaign or initiative)
This is the entire clue.
(Other definitions for drive that I've seen before include "Avenue" , "Chauffeur -- force" , "Hit ball with force" , "offensive" , "demand for chauffeur" .)
'campaign' is the definition.
(I know that campaign can be written as fight)
This is the entire clue.
(Other definitions for fight that I've seen before include "Box" , "(Take part in) battle" , "Attack or engage in combat" , "Conflict" , "Strive - struggle" .)
'campaign' is the definition.
(I know that crusade is a kind of campaign)
This is all the clue.
(Other definitions for crusade that I've seen before include "Religious war" , "Vigorous campaign" , "Action by Christians to recapture the Holy Land" , "Holy war" , "Used car involved in campaign for a cause" .)