High-spirited pal fully tipsy after draining single litre (7)
I believe the answer is:
playful
'high-spirited' is the definition.
(thesaurus)
'pal fully tipsy after draining single litre' is the wordplay.
I cannot quite see how this works, but
an anagram of 'pal' is 'pla' which is located in the answer.
'litre' could be 'l' ('l' can be a synonym of 'litre') and 'l' is located in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for playful that I've seen before include "Fond of games; light-hearted" , "Teasing, unserious" , "Lively" , "Frolicsome" , "Fun-loving" .)