Possible Clues:

• Climbing plant with showy flowers — Islam etc (anag)
• Genus of climbing-plants that includes traveller's joy
• Climate affected small garden plant
• Climbing plant in variety of climates
• Plant in changed climate succeeded
• Climber's cleat is abandoned around mountain top
• Flowering plant such as 'old man's beard'
• Climber succeeded after Tim and Alec somehow
• Shrub climate’s spoilt
• Climbing plant — as I'm Celt (anag)