There's a running joke amongst climbers as to whether "Clova is in". This is in reference to the relative scarcity of good winter climbing conditions, mostly due to the low altitude of the climbs here. From a skiing point of view, good conditions are even more elusive, but they do exist! The top of cliffs are only at 750m a.s.l., so good conditions are tricky to come by. Snow bearing Southerly, or Southwesterly winds will fill the gullies, but you'll have to consider snow stability. Needless to say, good conditions rarely hang around for long.
Approach
The shortest and most convenient approach is to park at the Ranger Station car park at the end of the Glen Clova road (Pay & Display). Follow the partially waymarked forestry tracks towards Corrie Fee. The track becomes a well maintained path for the last few hundred metres, bringing you into the corrie at the edge of the forest. At just over 3km, and only 200m ascent to this point, you should be able to get into the corrie within the hour. This provides a fine viewpoint of the corrie, and allows you to asses your options.
To access A Gully and B Gully, follow the path into the corrie, and then cross the stile over the deer fence. To get to D Gully, keep following the path, and as it cuts across the base of the cliff, D Gully is up to your left.
Other possibilities
With the right snowcover, there are plenty of options in the vicinity of the corrie. A descent of B Gully from the top is there for the brave to try in the right conditions, and E Gully looks like is could be worth a run. There are a couple of South facing gully lines descending from Craig Rennet that look worthwhile, and Coire Sharroch has at least a couple of nice looking lines. Out of the corrie, there are several possibilities on either side of Glen Doll, descending from Craig Maud and Craig Damff.
Relevant Weather Forecasts