Old warrior in Asia perhaps, drinking spirit on retirement (7)
I believe the answer is:
samurai
'old warrior' is the definition.
'samurai' can be an answer for 'warrior' (samurai is a kind of warrior). I'm not sure about the 'old' bit.
'asia perhaps drinking spirit on retirement' is the wordplay.
'perhaps' is an anagram indicator.
'drinking' is an insertion indicator.
'spirit' becomes 'rum' (I've seen this before).
'on retirement' says the letters should be written backwards.
'rum' in reverse letter order is 'mur'.
'asia' anagrammed gives 'saai'.
'saai' enclosing 'mur' is 'SAMURAI'.
'in' is the link.
Can you help me to learn more?
(Other definitions for samurai that I've seen before include "Trad. Japanese warrior caste" , "Member of military class" , "Historical Japanese warrior" , "Military figures" , "Japanese militarist" .)