Teetering at the far end, I get nervous (12)
I believe the answer is:
fainthearted
'nervous' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'teetering at the far end i' is the wordplay.
'at the far end i' anagrams to 'FAINTHEARTED'.
However, I am not clear how the anagram is indicated.
'get' acts as a link.
Can you help me to learn more?
(Other definitions for fainthearted that I've seen before include "Lacking courage" , "Timid" , "Timorous -- find a theatre (anag)" .)