Tedium in the bedroom? (7)

I believe the answer is:

boredom

I'm a little stuck... Click here to teach me more about this clue!

'tedium' is the definition.
(I know that tedium can be written as boredom)

'the bedroom?' is the wordplay.
'bedroom' can be anagrammed to 'BOREDOM'.
However, I'm unsure how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for boredom that I've seen before include "Feeling" , "Ennui in bedroom" , "Monotony" , "Overseers" , "no interest" .)

I've seen this clue in The Irish Independent.

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