Pertinent; applicable (8)
I believe the answer is:
relevant
I believe this clue is a double definition.
'pertinent' is the first definition.
(similar in meaning)
'applicable' is the second definition.
(similar in meaning)
(Other definitions for relevant that I've seen before include "To the point" , "Applicable" , "Related to the matter in hand" , "Significant" , "Germane or pertinent" .)