Such problems as trees can possibly present (7)
I believe the answer is:
teasers
'such problems' is the definition.
Although both the answer and definition are plural nouns, I can't see how they can define each other.
'as trees can possibly present' is the wordplay.
'as trees' anagrams to 'TEASERS'.
However, I'm not clear how this is indicated.
Can you help me to learn more?
(Other definitions for teasers that I've seen before include "Tricky questions" , "Difficult problems or people who chaff" , "Steers a way with riddles" , "Puzzles" , "Problems that are difficult to solve" .)