Sneakiest cost involved to obtain travel passes (6,7)
I believe the answer is:
season tickets
'obtain travel passes' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'sneakiest cost involved' is the wordplay.
'involved' is an anagram indicator (involved can mean confusing or complex).
'sneakiest'+'cost'='sneakiestcost'
'sneakiestcost' with letters rearranged gives 'SEASON-TICKETS'.
'to' is the link.
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