Donkey’s over being attached to sticky part of plant (5)

I believe the answer is:
burro
'donkey's' is the definition.
(term for a small donkey)
'over being attached to sticky part of plant' is the wordplay.
'over' becomes 'o' (cricket abbreviation).
'being attached to' means one lot of letters go next to another.
'sticky part of plant' becomes 'burr' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'o' put after 'burr' is 'BURRO'.
Can you help me to learn more?
(Other definitions for burro that I've seen before include "Spanish donkey" , "Beast of burden" , "Small donkey used as a pack animal" , "Small donkey (US)" .)
