Stern child sorry about tense picture (4,2,3,6)
I believe the answer is:
back to the future
'picture' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'stern child sorry about tense' is the wordplay.
I cannot really see how this works, but
'stern' could be 'back' (stern is the back of a boat) and 'back' is found in the answer.
'child' could be 'tot' (term for a young child) and 'tot' is present in the answer.
'about' could be 're' (regarding) and 're' is found within the answer.
'tense' could be 't' (abbreviation used in many dictionaries) and 't' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for back to the future that I've seen before include "Series of popular time-travel movies" , "film" .)