Crossword Genius

Head left periodically for a swift one? (4)

Ross

I believe the answer is:

half

'a swift one?' is the definition.
(both can mean a quick or small alcoholic drink)

'head left periodically' is the wordplay.
'periodically' means one should take alternating letters (letters must be selected 'every so often').
'head'+'left'='headleft'
The alternate letters of 'headleft' are 'HALF'.

'for' is the link.

(Other definitions for half that I've seen before include "Fifty percent" , "One of two equal parts" , "little drink" , "Some football" , "shared round" .)

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