Ihold no brief for McKenna, but "scatt" is given as a Cornish word for wind, or blow, in my Chambers, which is the latest edition.  I have not forgiven this setter for giving "defence mechanism" as a clue for "ink sac":  maybe it is, but it would take a convoluted mind that would jump to that as the answer to the clue.  There were lots of complaints about this setter in this column a little while back.  I consider him to be unfair, misleading and sometimes inaccurate.