A vessel in mourning (3)

I believe the answer is:

urn

'a vessel' is the definition.
(urn is a type of container)

'in mourning' is the wordplay.
'in' indicates a hidden word.
'URN' can be found hidden inside 'mourning'.

(Other definitions for urn that I've seen before include "Holder of the Ashes?" , "Funerary vessel" , "Pot, vase" , "Vase-shaped vessel" , "Large pot for coffee or tea" .)

I've seen this clue in the Evening Standard.

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