Wrong road for peninsula (5)
I believe the answer is:
sinai
'peninsula' is the definition.
(Sinai is an example)
'wrong road' is the wordplay.
'wrong' becomes 'sin' (I've seen this before).
'road' becomes 'ai' (I've seen this in other clues).
'sin'+'ai'='SINAI'
'for' acts as a link.
(Other definitions for sinai that I've seen before include "Biblical mount" , "Peninsula, mostly desert, at north end of Red Sea" , "Mountain source of Mosaic Law" , "Mt. where Moses received 10 Commandments" , "desert area" .)