Climber making love bloom (13)
I believe the answer is:
passionflower
'climber' is the definition.
(type of climbing plant)
'love bloom' is the wordplay.
'love' becomes 'passion' (synonyms).
'bloom' becomes 'flower' (synonyms).
'passion'+'flower'='PASSIONFLOWER'
'making' is the link.
(Other definitions for passionflower that I've seen before include "Climbing plant, Passiflora" , "Tropical climbing plant (granadilla)" .)