Mum's research facility set up medicinal product using resin (6)
I believe the answer is:
balsam
'resin' is the definition.
(balsam is a kind of resin)
'mum's research facility set up' is the wordplay.
'mum's' becomes 'mas' ('ma' can be a synonym of 'mum').
'research facility' becomes 'lab' (I am not sure about this - if you are sure you should believe this answer much more).
'set up' is a reversal indicator.
'mas'+'lab'='maslab'
'maslab' backwards is 'BALSAM'.
'medicinal product using' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for balsam that I've seen before include "Soothing herb" , "Herb for healing" , "Fragrant medicinal plant resin" , "Fragrant ointment" , "Aromatic soothing medicament" .)