Clue: Disgraced ex-president loses temper at first, having lost in card game (8)
Answer: PINOCHLE
Explanation: Definition: card game
An envelope ('having … in') of L ('lost'; the abbreviation is not given in Chambers, but I would have thought it common enough) in PINOCHE[t] ('disgraced ex-president') minus the T ('loses **T**emper at first').