Crossword Genius

Edward promises to be dull (7)

Ross

I believe the answer is:

tedious

'be dull' is the definition.
(similar in meaning)

'edward promises' is the wordplay.
'edward' becomes 'ted'.
'promises' becomes 'IOUs' (promises to pay a debt).
'ted'+'ious'='TEDIOUS'

'to' is the link.

(Other definitions for tedious that I've seen before include "Wearisome, boring" , "drab" , "awfully boring" , "Boring, monotonous" , "flat" .)

I've seen this clue in The Mirror and The Daily Express.
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