Earth and lime mixture providing resin (5)
I believe the answer is:
elemi
'resin' is the definition.
(I know that elemi is a type of gum resin)
'earth and lime mixture' is the wordplay.
'earth' becomes 'E'.
'and' means one lot of letters go next to another.
'mixture' is an anagram indicator.
'lime' anagrammed gives 'lemi'.
'e'+'lemi'='ELEMI'
'providing' acts as a link.
(Other definitions for elemi that I've seen before include "Extract" , "It's fragrance" , "Fragrant resin used as incense - Emile (anag)" , "Tree resin; ie, elm (anag.)" , "Oleoresin" .)