Person likely to fall for tourist (7)
I believe the answer is:
tripper
'for tourist' is the definition.
(tripper is a kind of tourist)
'person likely to fall' is the wordplay.
'person likely' becomes 'per' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to' means one lot of letters go next to another (I've seen this in other clues).
'fall' becomes 'trip' (as in tripping over).
'per' after 'trip' is 'TRIPPER'.
Can you help me to learn more?
(Other definitions for tripper that I've seen before include "Tourist" , "Excursionist" , "One out for pleasure" , "who might get a booking?" , "Someone out for day" .)