Scold son behind schedule (5)
I believe the answer is:
slate
'schedule' is the definition.
(as in a film slated for release)
'scold son behind' is the wordplay.
I cannot quite understand how this works, but
'son' could be 's' (genealogical abbreviation for son) and 's' is located in the answer.
'behind' could be 'late' (as in behind schedule) and 'late' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for slate that I've seen before include "Stone used for roofing" , "Roofing plate" , "Metamorphic rock that can be split into thin layers" , "Roof tile or pub credit" , "Bluish-grey colour" .)