Perhaps it means, roughly, about meaning (8)
I believe the answer is:
semantic
'about meaning' is the definition.
(I've seen this before)
'perhaps it means roughly' is the wordplay.
'perhaps' is an anagram indicator.
'roughly' becomes 'c' (circa).
'it'+'means'='itmeans'
'itmeans' anagrammed gives 'semanti'.
'semanti'+'c'='SEMANTIC'
(Other definitions for semantic that I've seen before include "Of difference in meaning of words" , "about what words mean" , "Of meaning and connotation in language" , "Tin maces could relate to the meaning of words" , "Relating to the study of meaning" .)