Preacher: no point looking toward Heaven? (6)

I believe the answer is:

bunyan

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'preacher' is the definition.
(I know that Bunyan is a preacher)

I don't understand how the rest of the clue works.

(Other definitions for bunyan that I've seen before include "Paul -, US mythic hero" , "John . . . . . . wrote 'The Pilgrim's Progress'" , "Writer" , "The Pilgrim's Progress author, d. 1688" , "author John" .)

I've seen this clue in The Times.

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