Concealed scarab caught out Middle Easterners (5)
I believe the answer is:
arabs
'middle easterners' is the definition.
(I've seen this in another clue)
'concealed scarab caught out' is the wordplay.
'concealed' indicates an anagram.
'caught' becomes 'c' (cricket abbreviation).
'out' suggests deleting specific letters.
'scarab' with 'c' removed is 'sarab'.
'sarab' anagrammed gives 'ARABS'.
(Other definitions for arabs that I've seen before include "Graceful horses" , "eg Saudis" , "Semitic people in the Middle East and northern Africa" , "Fine horses" , "They live mainly in the Middle East and North Africa" .)