title: How to clip just one column of dataframe
body: <p>I have a pandas dataframe comprised of 3 columns: from [datetime64], to [datetime64], value [float64].
  I just want to clip the "value" column to a maxmimum value.</p>
  
  <p><code>df = dfo.clip(upper=100)</code></p>
  
  <p>fails with <code>TypeError: Cannot compare type 'Timestamp' with type 'int'</code></p>
  
  <p>How can I clip just on column of a dataframe?</p>