Artist who can't visualise seascapes? (8)

I believe the answer is:

landseer

I believe this is a double definition.

'artist' is the first definition.
(Edwin Landseer RA)

'who can't visualise seascapes?' is the second definition.
(cryptic definition - person seeing land)

(Other definitions for landseer that I've seen before include "Dan reels about the painter" , "See 1 down" , "Victorian animal painter" , "The Monarch of the_Glen painter" , "Sir Edwin -, Monarch of the Glen painter" .)

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