Nudge1 As the title and intro suggest, you are looking for a set of seven. (Personal experience with any or all of them may be helpful but is certainly not required.)
Nudge 2 Only six of the seven are in the grid. Those six plus one other related entry are symmetrically placed.
Nudge 3 hese six (and the missing seventh) are the kinds of things people might try to hide. Consequently, they are hidden (though not very subtly) in the themers.
Nudge 4 A good place to start looking: entries that are a) longer and b)awkward, i.e., not the kind of phrase that would pop up in everyday speech.