Be retrograde to restore timepiece (3,3,5,4)
I believe the answer is:
put the clock back
'be retrograde to restore' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'timepiece' is the wordplay.
I cannot really understand how this works, but
'timepiece' could be 'clock' (clock is a kind of timepiece) and 'clock' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for put the clock back that I've seen before include "Do it on October 27" , "restoring the taximeter" , "as the UK does towards the end of October" , "Take a retrograde step" , "Regress" .)