[Jstylezzz]

pawn Код:

format(clanquery, sizeof(clanquery), "UPDATE clans SET clankills= '%d'  WHERE clanname = '%s'",GetPlayerClanKills(playerid) +1,GetPlayerClan(killerid));
    mysql_query(clanquery);

Try this, I'm not sure what you use to define the clankills, but you can change getPlayerClanKills to your method.