Too much noise in the reading room (3)

I believe the answer is:

din

'too much noise' is the definition.
(I've seen this before)

'in the reading room' is the wordplay.
'in' indicates the answer is hidden within the clue.
'DIN' is hidden within 'reading room'.

(Other definitions for din that I've seen before include "Rumpus" , "commotion" , "Clamour" , "A lot of noise (3)" , "Row, noise" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app