Remember a mystery caller (6)

I believe the answer is:

recall

'remember' is the definition.
(synonyms)

'a mystery caller' is the wordplay.
'a mystery' indicates anagramming the letters.
'caller' with letters rearranged gives 'RECALL'.

(Other definitions for recall that I've seen before include "Get back" , "order to come back" , "Summon back or bring to mind" , "Recollect" , "Don''t forget - come again" .)

I've seen this clue in the Evening Standard.

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