Fashionable range turned out to be for real (2,5)
I believe the answer is:
in anger
'turned out to be for real' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'fashionable range' is the wordplay.
I cannot really see how this works, but
'fashionable' could be 'in' (in can mean fashionable or trendy) and 'in' is found in the answer.
an anagram of 'range' is 'anger' which is within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for in anger that I've seen before include "Look back - - , Osborne play" , "Irately" , "(Look back) with hostility?" .)