Cannier, more secretive (6)
I believe the answer is:
cagier
I believe this clue is a double definition.
'cannier' is the first definition.
('cagy' can be a synonym of 'canny')
'more secretive' is the second definition.
(I've seen this in another clue)
(Other definitions for cagier that I've seen before include "Cannier, more secretive" , "More circumspect" , "Cannier or more wary" , "Ace rig (anag) - less frank" .)