Developed the wrong way! (5)
I believe the answer is:
'developed the wrong way' is the definition.
'grown' can be an answer for 'developed' (I've seen this before). I'm not certain of the 'the wrong way' bit.
'developed the wrong' is the wordplay.
'developed' indicates anagramming the letters.
'wrong' is an anagram of 'GROWN'.
Can you help me to learn more?
(Other definitions for grown that I've seen before include "Increased; raised" , "Raised; having got bigger" , "Big" , "Wrong (anag)" , "Cultivated" .)