Yes! Foot never broken at intervals! (5,2,5)
I believe the answer is:
every so often
'at intervals' is the definition.
(I've seen this before)
'yes foot never broken' is the wordplay.
'broken' indicates an anagram.
'yes'+'foot'+'never'='yesfootnever'
'yesfootnever' is an anagram of 'EVERY SO OFTEN'.
(Other definitions for every so often that I've seen before include "Occasionally" , "At intervals" .)