Cut back to the relations as they put the children to bed (4,2)
I believe the answer is:
tuck in
'bed' is the definition.
(thesaurus)
'cut back to the relations as they put the children' is the wordplay.
I cannot really see how this works, but
an anagram of 'cut' is 'tuc' which is located in the answer.
'relations' could be 'kin' (both can mean one's family) and 'kin' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for tuck in that I've seen before include "Substantial meal" , "Go ahead and eat!" , "Arrange comfortable retirement" , "have hearty meal" , "Eat heartily" .)