Sublime swindle taking in some: don’t fall into it! (5,6)
I believe the answer is:
grand canyon
'don't fall into it' is the definition.
I can't tell whether this defines the answer.
'sublime swindle taking in some' is the wordplay.
'sublime' becomes 'grand' (both can mean excellent or fine).
'swindle' becomes 'con' (con is a kind of swindle).
'taking in' is an insertion indicator.
'some' becomes 'any' (similar in meaning).
'con' placed around 'any' is 'canyon'.
'grand'+'canyon'='GRAND CANYON'
Can you help me to learn more?
(Other definitions for grand canyon that I've seen before include "nickname of US State" , "American gorge" , "Major feature in Arizona" , "Colorado River gorge" , "Arizona tourist attraction" .)