Trick with passion round back of bottling plant (8)
I believe the answer is:
foxglove
'plant' is the definition.
(foxglove is a kind of plant)
'trick with passion round' is the wordplay.
'trick' becomes 'fox' ('fox' can be a synonym of 'trick').
'with' is a charade indicator (letters next to each other).
'passion round' becomes 'glove' (I am not sure about this - if you are sure you should believe this answer much more).
'fox'+'glove'='FOXGLOVE'
'back of bottling' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for foxglove that I've seen before include "Plants of the genus Digitalis" , "Plant (of the genus 10 down) with bell-shaped flowers" , "Source of 1 dn" , "that grows wild" , "Flowering plant that's source of digitalis" .)