As I said previously, the controller used nonstandard phraseology. The
controller from the start intended for the descent to be at pilot's
discretion, she verified that it was when the pilot asked for clarification.
The clearance was not amended.

IF the controller intends to say "turn heading 270 intercept the
localizer" but instead actually says "turn heading 170 intercept the
localizer" and the pilot, sensing that 170 is not an approprite heading
and that 270 is probably what was intended, asks "confirm heading 270,
straight west" and the controller says "affermative, heading 270
intercept the localizer", was the clearance amended?

Jose
--
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