Nomads use trails central for these tribes people (5)
I believe the answer is:
masai
'nomads use' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'trails central for these tribes people' is the wordplay.
'central' says to take the centre.
'for' says to put letters next to each other (I've seen this in other clues).
'these tribes people' becomes 'mas' (I am not sure about this - if you are sure you should believe this answer much more).
The middle of 'trails' is 'ai'.
'ai' put after 'mas' is 'MASAI'.
Can you help me to learn more?
(Other definitions for masai that I've seen before include "East African tribesman" , "E.African pastoral people" , "People of the highlands of Kenya and Tanzania" , "Well-known tribe of Eastern Africa" , "African tribespeople" .)