I had a spookier spin on this one Thea, maybe because psychokinesis is the supposed ability to move objects by mental thought alone, then the setter might be playing a spooky prank by leaving out the bracketed letter count and he/she has put them somewhere else in the newspaper as a means of definition. A bit of a stretch but very cool if so.
However, I can't be arsed looking for them now, goodnight all.
Just to let anyone know who hasn't got a copy, the (13) is missing at the end of the clue.