Mobile can disturb poor alto (8)

I believe the answer is:

portaloo

'mobile can' is the definition.
(portable toilet)

'disturb poor alto' is the wordplay.
'disturb' is an anagram indicator (I've seen 'disturbed' mean this (the order of letters is disturbed)).
'poor'+'alto'='pooralto'
'pooralto' with letters rearranged gives 'PORTALOO'.

I've seen this clue in The Times.

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