I got drunk after very briefly feeling high (7)
I believe the answer is:
vertigo
'feeling high' is the definition.
'vertigo' can be an answer for 'feeling' (I have seen 'unbalanced feeling' mean 'vertigo' so perhaps 'feeling' could also mean 'vertigo'). I'm not certain of the 'high' bit.
'i got drunk after very briefly' is the wordplay.
'drunk' indicates anagramming the letters.
'after' is a charade indicator (letters next to each other).
'briefly' means to remove the last letter.
'very' with its final letter removed is 'ver'.
'i'+'got'='igot'
'igot' anagrammed gives 'tigo'.
'tigo' after 'ver' is 'VERTIGO'.
Can you help me to learn more?
(Other definitions for vertigo that I've seen before include "Sensation of dizziness brought on by heights" , "Hitchcock film - giddiness" , "Sensation brought on by great heights" , "Whirling sensation when balance is disturbed" , "Dizziness due to disorder in sense of balance" .)