Cryptic Crossword Clues

I am stuck on the last couple of clues for this C.C. and request some help. Remaining are the following:

1.) Zealous objectives stated (7)

__ __ T __ N __ __

2.) Remaining sinister (4)

__ __ __ T

3.) Fastener about stray dog (7)

T __ R __ __ __ R