Reminder from Rove in US assembly (8)
I believe the answer is:
souvenir
'reminder' is the definition.
(I've seen this before)
'rove in us assembly' is the wordplay.
'assembly' indicates an anagram.
'rove'+'in'+'us'='roveinus'
'roveinus' with letters rearranged gives 'SOUVENIR'.
'from' acts as a link.
(Other definitions for souvenir that I've seen before include "Reminder of past events" , "remember seeing this?" , "Keepsake, memento" , "something worth keeping" , "Reminder of holiday" .)