I just bottled a simple Belgian brown today. Poured myself an un-carbed glass of it and my first thoughts were 'Mmmm, Leffe Brune'. Not what I was going for and not sure where it'll end up after a few weeks in the bottle but here is the recipe if you are interested.
2kg Pale malt
1Kg Light DME
0.5kg Special B
0.8kg Lylle's golden syrup
0.2kg brown sugar
80g Mount Hood hops at 60 mins
fermented on the low end (i.e. just left it at whatever temp the room is at)
OG: 1.045 ish before sugar, sugar added during fermentation (which was done in about a day)
There are more recipes (with a lot of ingredients) on this forum if you do a search. Some include wheat and oats but the label says only barley, hops, water if i remember rightly. My friend can't have wheat so i remember checking for it.
This isn't a clone as i say, but it does remind me a lot of Leffe brune.
Hope it helps!