Hi AJT.
I'm in complete awe that you have done & sent in the Mephisto for such a long period of time. It will be interesting to see what reply you get from the Times Crossword Club.
The 7d clue is: "Where to find getaway vehicle belonging to despot caught right off?"
The answer seems to be: 'inksac' (although I think Chambers, at least, shows this to be hyphenated: 'ink-sac').
As K pointed out (post 10): "Squid use their ink as an escape to confuse predators".
In mild defence of Paul McKenna ...
Parts of the Chambers definition for 'vehicle' read: "a means of conveyance or transmission ... ... a medium, eg for the expressing or performing of something; a substance with which a medicine, a pigment, etc, is mixed for administration or application; ..."
In this case, 'ink' (substance containing a pigment) is the 'getaway vehicle' and is found where? In an 'inksac'!
It's definitely cryptic but it does seem to work!
JimC