Tackiest ones surprisingly good for access during a specific period, at a reduced rate (6,6)
I believe the answer is:
season ticket
'access during a specific period at a reduced rate' is the definition.
I can't tell whether this defines the answer.
'tackiest ones surprisingly' is the wordplay.
'surprisingly' is an anagram indicator (a surprising ordering of the letters).
'tackiest'+'ones'='tackiestones'
'tackiestones' with letters rearranged gives 'SEASON-TICKET'.
'good for' acts as a link.
Can you help me to learn more?
(Other definitions for season ticket that I've seen before include "At length, pass" , "Football pass, for example" , "Period travel permit" , "Entitlement to regular travel" , "Long term permit" .)