We are being too casual –
in six completely different languages, in actual fact!
Every of those clues comprises a second-person pronoun in some language; it must be modified to the formal model of that pronoun. (So French “tu” turns into “vous”; Spanish “tú” turns into “usted”…)
Moreover, every clue additionally has a second-person conjugation of the phrase for “to be” in that language – we have to change that to the formal kind as effectively.
The total listing is:
[Italian: “tu sei” → “Lei è”]
Tua’s fathseir
→ Leia’s father[Spanish: “tú eres” → “usted es”]
They jotú in cheress
→ They jousted in chess[German: “Du bist” → “Sie sind”]
Duge the place some have been Bistarin
→ Siege the place some have been Sindarin[Czech: “ty jsi” → “vy jste”]
Dwelling of NJ’s Irrace and Ity golf equipment
→ Dwelling of NJ’s Terrace and Ivy golf equipment[French: “tu es” → “vous êtes”]
Nertuness of athles and actors
→ Nervousness of athletes and actors[Latvian: “tu esi” → “jūs esat”]
Tutin Gatlin, Ares, Ihena, e.g.
→ Justin Gatlin, Ares, Athena, e.g.
Now the clues may be answered!
The clue solutions are:
Leia’s father:
DAR(T)H (V)A(D)ER
They jousted in chess:KN(I)GHT(S)
Siege the place some have been Sindarin:MINAS (T)IR(I)TH
Dwelling of NJ’s Terrace and Ivy golf equipment:PRI(N)(C)ETON
Nervousness of athletes and actors:S(T)AGE FR(I)GHT
Justin Gatlin, Ares, Athena, e.g.:(O)LYMPIA(N)
And the circled letters spell TV DISTINCTION – the “formal/casual” distinction that this puzzle is about, and in addition an applicable description of an Emmy award!