Steep bank? It may be deceptive (5)

I believe the answer is:

bluff

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'steep bank?' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for bluff that I've seen before include "Pleasantly direct" , "Deceive by concealing weakness" , "Feign" , "Steep promontory" , "Pretend - headland" .)

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