Crossword Genius

Periodically fancy that series of old deeds (4)

Ross

I believe the answer is:

acta

'series of old deeds' is the definition.
(historic term for a collection of records)

'periodically fancy that' is the wordplay.
'periodically' means one should take alternating letters (letters must be selected 'every so often').
'fancy'+'that'='fancythat'
The alternate letters of 'fancythat' are 'ACTA'.

(Other definitions for acta that I've seen before include "records" , "minutes of official proceedings" .)

I've seen this clue in The Guardian.
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