Clue: Vigilant, attentive lackey: expeditiously tending, primarily? (5)
Answer: VALET
Explanation: Vigilant, attentive lackey: expeditiously tending, primarily? (5)
The 'primarily' clue: first letters of '**V**igilant **A**ttentive **L**ackey **E**xpeditiously **T**ending', with an &lit definition.