August, and I am ready for holiday snap! (8)

I believe the answer is:

imposing

'august' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for imposing that I've seen before include "Taking liberties" , "Impressive - or putting tax on" , "Grand, impressive" , "Dictating; impressive" , "Majestic" .)

I've seen this clue in The Times.

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