Unorthodox belief in this place starts to surprise you (6)
I believe the answer is:
Here is my best explanation:
'unorthodox belief' is the definition.
(I've seen this before)
'this place starts to surprise you' is the wordplay.
'this place' becomes 'here' (I've seen this before).
'starts to' suggests taking the first letters.
The first letters of 'surprise you' is 'sy'.
'in' acts as a link.