Involve relative wearing green the wrong way (7)
I believe the answer is:
embroil
'involve' is the definition.
(thesaurus)
'relative wearing green the wrong way' is the wordplay.
'relative' becomes 'bro' (I've seen this before).
'wearing' means one lot of letters goes inside another.
'green' becomes 'lime' (I've seen this before).
'the wrong way' is a reversal indicator.
'lime' in reverse letter order is 'emil'.
'bro' put within 'emil' is 'EMBROIL'.
(Other definitions for embroil that I've seen before include "Involve (someone) in a dispute" , "catch up" , "Involve (someone) in trouble" , "Drag in - bole rim (anag)" , "Involve in argument or quarrel" .)