Pertinent, relevant (3)
I believe the answer is:
apt
I believe this clue is a double definition.
'pertinent' is the first definition.
(synonyms)
'relevant' is the second definition.
(I've seen this in another clue)
(Other definitions for apt that I've seen before include "Tending" , "Suitable, appropriate" , "Fitting - inclined" , "Apposite, appropriate" , "Train" .)