Adore holding son back (7)
I believe the answer is:
Here is my best explanation:
'back' is the definition.
'adore holding son' is the subsidiary indication.
'adore' becomes 'revere' (revering is a kind of adoring).
'holding' indicates putting letters inside.
'son' becomes 's'.
'revere' placed around 's' is 'reverse'.
(Other definitions for reverse that I've seen before include "contrary", "Move backwards", "Turn back to front", "Change", "Setback; go back", "Turn inside out or upside down", "Go backwards", "A setback", "Defeat - setback - other side" and "Rescind (decision)".)