Clue: Obedient duke you almost argue with close to Malibu lake (7)
Answer: DUTIFUL
Explanation: Definition: Obedient
 D(abbrev. for "duke") + U(abbrev. for "you" in texting) + "tiff"(to argue/to have a alight disagreement with) **minus ****its last letter**(almost …) **plus**(with) **last letter of**(close to) "Malibu" + L(abbrev. for "lake").