This person's so dull, I'm bored stupid! (7)

I believe the answer is:

bromide

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'this person's so dull' is the definition.
The definition suggests a singular noun which matches the answer.

'i'm bored stupid' is the wordplay.
'stupid' indicates anagramming the letters (in a stupid order).
'im'+'bored'='imbored'
'imbored' with letters rearranged gives 'BROMIDE'.

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(Other definitions for bromide that I've seen before include "Trite remark" , "Trite fob-off" , "Dim bore (anag.)" , "Platitude" , "that could send you to sleep?" .)

I've seen this clue in The Independent.

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