New oven Henry wanted periodically (5,3,3,4)
I believe the answer is:
every now and then
'periodically' is the definition.
(I've seen this before)
'new oven henry wanted' is the wordplay.
'new' indicates anagramming the letters.
'oven'+'henry'+'wanted'='ovenhenrywanted'
'ovenhenrywanted' is an anagram of 'EVERY NOW AND THEN'.
(Other definitions for every now and then that I've seen before include "at times" , "Not all of the time" , "periodically" , "Occasionally" .)