Could this identity document reverse a dismissal? (5,4)
I believe the answer is:
green card
'reverse a dismissal?' is the definition.
The definition suggests a singular noun which matches the answer.
'could this identity document' is the wordplay.
'could this identity' becomes 'green' (I can't justify this - if you can you should believe this answer much more).
'document' becomes 'card' (card is a kind of document).
'green'+'card'='GREEN CARD'
Can you help me to learn more?
(Another definition for green card that I've seen is " US work and residence permit for foreign nationals".)