title: Delete a column in a data frame within a list
body: <p>I made a list out of my dataframe, based on the factor levels in column A. In the list I would like to remove that column. My head is saying lapply, but not anything else :P</p>
  
  <pre><code>$A
  ID Test
  A   1
  A   1
  
  $B
   ID Test
   B   1
   B   3
   B   5
  </code></pre>
  
  <p>Into this  </p>
  
  <pre><code>$A
  Test
   1
   1
  
  $B
  Test
   1
   3
   5
  </code></pre>