Huntress served master on first being introduced (7)
I believe the answer is:
artemis
'huntress' is the definition.
(I've seen this before)
'served master on first being introduced' is the wordplay.
'served' indicates anagramming the letters.
'on first' becomes 'i' (Roman numeral for one or first. I am not sure about the 'on' bit.).
'being introduced' indicates putting letters inside (some letters are introduced or inserted in).
'master' anagrammed gives 'artems'.
'artems' enclosing 'i' is 'ARTEMIS'.
Can you help me to learn more?
(Other definitions for artemis that I've seen before include "God" , "Olympian figure" , "Head-hunter" , "a famous hunter" , "Huntress daughter of Zeus" .)