Give the thumbs up to a virtual classic (5)
I believe the answer is:
agree
'give the thumbs up' is the definition.
Both the definition and answer are verbs in their base form.
Perhaps there's an association between them I don't understand?
'a virtual classic' is the wordplay.
'virtual classic' becomes 'gree' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'gree'='AGREE'
'to' is the link.
Can you help me to learn more?
(Other definitions for agree that I've seen before include "Settle" , "grant" , "Have the same idea" , "Have the same opinion" , "Concur, acquiesce" .)