Explanatory list of terms (8)
I believe the answer is:
glossary
'explanatory list of terms' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for glossary that I've seen before include "List of words with meanings" , "one may see meaning here" , "List of technical terms in an appendix" , "where terms are laid out" , "Explanation of terms" .)