Grown the mistaken way (5)
I believe the answer is:
wrong
'mistaken way' is the definition.
'wrong' can be an answer for 'mistaken' (I've seen this in another clue). I'm not sure about the 'way' bit.
'grown' is the wordplay.
'grown' can be anagrammed to 'WRONG'.
However, I am not clear how this is indicated.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for wrong that I've seen before include "Inaccurate" , "Erronious" , "Mistaken" , "Incorrect, illegal or immoral" , "Not correct" .)