33 looks like 'Physical geography' but that's only got two words
(assuming that the '3' in your clue is the word count) and includes a word given in the clue (which is lousy clue-setting) but, given the errors which turn up in some quizzes, it might still be a possibility!
^^^ Oh, hang on. Looking at Dave's answer it seems that the number indicates the length of the string at either end of the word. (It does help to know things like this!)
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