Like a wave from the supporters (7)
I believe the answer is:
mexican
'like' is the definition.
Although both the answer and definition are adjectives, I cannot understand how they can define each other.
'a wave from the supporters' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found in the answer.
'from' could be 'e' (I've seen this in other clues) and 'e' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for mexican that I've seen before include "A central American" , "Latin" , "From Chihuahua, perhaps" , "From Guadalajara or Acapulco?" .)