Point of concern or theme (5)
I believe the answer is:
north
'point' is the definition.
(north is a kind of point)
'of concern or theme' is the wordplay.
'of' indicates a hidden word.
'NORTH' is hidden in the letters of 'concern or theme'.
(Other definitions for north that I've seen before include "One of four bridge players" , "Towards top of map" , "who has to follow West's lead?" , "usually featured at the top of the charts?" , "Cardinal compass point" .)