Restrained lag walked with head dropped (10)
I believe the answer is:
controlled
'restrained' is the definition.
('control' can be a synonym of 'restrain')
'lag walked with head dropped' is the wordplay.
'lag' becomes 'con' (both can mean a convict).
'walked' becomes 'trod' (treading is a kind of walking).
'with' means one lot of letters goes inside another.
'head dropped' becomes 'lle' (I am not sure about this - if you are sure you should believe this answer much more).
'trod' going around 'lle' is 'trolled'.
'con'+'trolled'='CONTROLLED'
Can you help me to learn more?
(Other definitions for controlled that I've seen before include "Regulated" , "under supervision" , "Restrained" , "Supervised" , "Disciplined" .)