Coleridge's sacred river (4)

I believe the answer is:

alph

'coleridge's sacred river' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for alph that I've seen before include "poetic river can be seen" , "Coleridge's sacred river" , "'Kubla Khan' river" .)

I've seen this clue in the Jonesin' and the Boston Globe.

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