Popular song by Michael Edwards and Bud Green that has been recorded by Tommy Dorsey, Patti Page and The Chimes, among others (4,2,1,5)
I believe the answer is:
once in a while
(Other definitions for once in a while that I've seen before include "Not very often" , "At times" , "Every now and again" , "Occasionally" .)
I've seen this clue in The Independent.
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