Climb initially into exotic tea tree and rest (2,6)
I believe the answer is:
et cetera
'rest' is the definition.
(I have seen 'the rest' mean 'et cetera' so perhaps 'rest' could also mean 'et cetera')
'climb initially into exotic tea tree' is the wordplay.
'initially' says to take the initial letters.
'into' is an insertion indicator.
'exotic' is an anagram indicator.
The first letter of 'climb' is 'c'.
'tea'+'tree'='teatree'
'teatree' anagrammed gives 'etetera'.
'c' going inside 'etetera' is 'ET CETERA'.
'and' is the link.
(Other definitions for et cetera that I've seen before include "And similar things" , "'And so forth (2,6)'" , "Including other similar items" , "Drive out, expel" , "something similar" .)