Solutions An encouraging stimulus has 15 entries with similar clues

• 3-letter words
• pep... talk (encouraging speech)
• 4-letter words
• odorolfactory stimulus
• atta"... girl!" (encouraging expression)
• spurStimulus
• 5-letter words
• eatupencouraging phrase to finish meal
• reactRespond to a stimulus
• 6-letter words
• picketGroup outside workplace encouraging strike action
• fillipStimulus
• newageSerenity-encouraging music genre
• 7-letter words
• impetusrushing away from oxford university for a stimulus
• kinesisMovement under stimulus
• 10-letter words
• afterimageVisual sensation despite the cessation of the stimulus
• 12-letter words
• heartwarmingencouraging core faction to hold on to weapon
• 14-letter words
• remote-controlDevice encouraging sedentary habits in TV watchers
• 15-letter words
• shot-in-the-armStimulus