Woozy boy finally follows advice (5)
I believe the answer is:
tipsy
'woozy' is the definition.
(I've seen this before)
'boy finally follows advice' is the wordplay.
'finally' says to take the final letters.
'follows' says to put letters next to each other.
'advice' becomes 'tips' (I've seen this in another clue).
The final letter of 'boy' is 'y'.
'y' put after 'tips' is 'TIPSY'.
(Other definitions for tipsy that I've seen before include "Loaded" , "Merry, squiffy" , "A bit drunk" , "Inebriated" , "1 over 8" .)