The most common and most likely answer to this crossword clue is the 10 letter word TACAMAHACS
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Buddy explains!
The straight part
We know that "Gum resins" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gum resins = tacamahacs.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TACAMAHACS mean?
TACAMAHACS noun- A bitter balsamic resin or resinous exudation obtained from tropical American trees of the family Burseraceae (Bursera tomentosa and Icica tacamahaca), from East Indian trees of the genus Calophyllum or from the balsam poplar (Populus balsamifera).
- Any tree yielding tacamahac resin, especially, in North America, the balsam poplar or balm of Gilead (Populus balsamifera).