Struck by the way Morse was sent out? (6)

I believe the answer is:

tapped

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'struck' is the definition.
(tapping is a kind of striking)

I can't explain the rest of the clue.

(Other definitions for tapped that I've seen before include "Rapped lightly or drew upon" , "Exploited (a resource)" , "Intercepted (a phone)" , "Knocked gently" , "Knocked; exploited" .)

I've seen this clue in the Evening Standard.

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