Sometimes for testing purposes (or an emergency) one might find it useful to remove query plan for a single stored procedure. This way you won't have to disrupt the entire instance (and possibly anger your fellow developers!).
I often forget that DBCC FREEPROCCACHE accepts a plan handle as a parameter value. There are a few ways to identify the plan handle, usually it involves the sys.dm_exec_cached_plans with a cross apply on sys.dm_exec_sql_text and sys.dm_exec_query_plan. (Feel free to scour the internet for a fully written query, I'm not going to reinvent the wheel here!).
Once you identify the proc and plan handle that you want to remove from cache simply run:
See the plan handle placed in parenthesis. This gives you granular control over the procedure cache.
Why not use Recompile? Of course this is an option and a lot more readable. Depending on your needs you can simply run
Exec sp _Recompile N'ProcName'