Pine product surrounds large biological copy (5)
I believe the answer is:
clone
'biological copy' is the definition.
(I've seen this in another clue)
'pine product surrounds large' is the wordplay.
'pine product' becomes 'cone' (I've seen this in another clue).
'surrounds' indicates putting letters inside.
'large' becomes 'L' (eg in clothes sizes).
'cone' placed around 'l' is 'CLONE'.
(Other definitions for clone that I've seen before include "Exact copy" , "Person who is identical to another" , "Exact replica" , "Biological replica" , "Organism reproduced asexually from one ancestor, like Dolly the sheep" .)