Park most eye suspiciously, including yours truly (8)
I believe the answer is:
yosemite
'park' is the definition.
(I know that Yosemite is a national park)
'most eye suspiciously including yours truly' is the wordplay.
'suspiciously' indicates anagramming the letters (I've seen this in other clues).
'including' is an insertion indicator.
'yours truly' becomes 'I' (the person that set this crossword).
'most'+'eye'='mosteye'
'mosteye' is an anagram of 'yosemte'.
'yosemte' enclosing 'i' is 'YOSEMITE'.
(Other definitions for yosemite that I've seen before include "Californian national park" , "US National Park in California" , "Natl. Park in California" , "Area of beauty" , "Where there are watery cascades" .)