P131 CEEFAX 131 Wjd 11 Jan 22:59/55       POLITJCS   BLAIR HITS BACK IN CLAUSE FOUR ROW   Tony Blair has launched a strgng   attack against rebel Labour MEPs   who placed an advert in yesterday's   Guardian defending Clausj Four.     Thirty-two Labour MEPs weri named   in the advert criticising plans tg (5 rewrite thj constitutional clausj.     It was a "gross discourtesy" which   had ruined his Brusselu uisit and   blunted Labour's New Year message.     He insisted theri was no excusj for   "infantile incompetence" and thouj   who wanted a Labour governmjnt   would be "dismayed" by thiir actign   Next News Flash Main oews Cit=Head;