Say I do understand problem of French revolutionary (3,7)
I believe the answer is:
get hitched
'say i' is the definition.
The definition suggests an adjective which matches the answer.
'do understand problem of french revolutionary' is the wordplay.
'do understand' becomes 'get' (getting is a kind of understanding).
'problem' becomes 'hitch' (hitch can mean a problem or delay).
'of french' becomes 'de' ('of' in French).
'revolutionary' says the letters should be written in reverse (letters revolve around).
'de' in reverse letter order is 'ed'.
'get'+'hitch'+'ed'='GET HITCHED'
Can you help me to learn more?
(Another definition for get hitched that I've seen is " Tie the knot".)