The others in for a deviation within particular terrain (10)
I believe the answer is:
rainforest
'particular terrain' is the definition.
The definition suggests a singular noun which matches the answer.
'the others in for a deviation within' is the wordplay.
'the others' becomes 'rest' (other people are the rest).
'deviation' is an anagram indicator.
'within' indicates putting letters inside.
'in'+'for'+'a'='infora'
'infora' anagrammed gives 'ainfor'.
'rest' placed around 'ainfor' is 'RAINFOREST'.
Can you help me to learn more?
(Other definitions for rainforest that I've seen before include "Luxuriant expanse" , "Dense luxuriant tropical zone" , "geographical feature" , "area of the Amazon?" , "has lots of tropical trees" .)