Escort a former president under revolutionary compatriot's protection (9)
I believe the answer is:
chaperone
'escort' is the definition.
(I know that chaperone is a more specific form of escort)
'a former president under revolutionary compatriot's protection' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for chaperone that I've seen before include "Young lady's protector" , "child-minder?" , "Guardian" , "attendant" , "my charges are small" .)