According to official FIDE rules, when queening a pawn, can you pause the clock? I have heard that you are allowed to pause to clock to find your queen. Is this true?
You may stop the clock if the piece that you wish to promote to is not at hand:


  6.12.b. A player may stop the chessclock only in order to seek the arbiter’s assistance, for example when promotion has taken place and
  the piece required is not available.