Mum rearranged the tinsel (6)

I believe the answer is:

silent

'mum' is the definition.
(to keep mum can informally mean to stay silent)

'rearranged the tinsel' is the wordplay.
'rearranged' indicates anagramming the letters.
'tinsel' with letters rearranged gives 'SILENT'.

(Other definitions for silent that I've seen before include "Utterly quiet" , "Dumb" , "Unspeaking" , "Wordless" , "Without sound" .)

I've seen this clue in The Irish Independent.

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