Possible Clues:

• Lacey's partner in fighting crime losing point of being secretive
• Displaying shrewdness
• Keeping things to oneself
• Is not Frank Pound going grey at the back?
• Sketchy
• Shrewd ... and a phonetic hint to this puzzle's four longest answers
• Secretive egret regularly hides in island
• The one that's not open could start to mature, like wine by the start of the year
• Kinda guarded, or a homophonic hint to the starred answers
• The one that's not open could start to mature like wine, by the start of the year