Relating to the meaning of words (8)
I believe the answer is:
semantic
'relating to the meaning of words' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for semantic that I've seen before include "Relating to meaning in language" , "Relating to the meaning of words" , "about what words mean" , "Tin maces could relate to the meaning of words" , "Of difference in meaning of words" .)