Trailers for comic drama Groundhog Day giving little away (4)
I believe the answer is:
cagy
'giving little away' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for cagy that I've seen before include "Guarded, noncommittal" , "Cautiously secretive" , "Cautious or secretive" , "Cautious and wary" , "Like bars" .)