Attempt to impress typified by conversion of barn to bar (4-4)
I believe the answer is:
name-drop
'bar' is the definition.
Both the answer and definition are verbs in their base form.
Perhaps you can see a link between them that I can't see?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for name-drop that I've seen before include "Mention familiarity with famous people to impress" , "Affect celebrity intimacy" , "Pardon me, being inclined to mention famous people I have met" , "Mention celebrities as friends" , "Mention important acquaintances" .)