Weak spirit served with old Spanish wine (8)
I believe the answer is:
impotent
'weak' is the definition.
(similar in meaning)
'spirit served with old spanish wine' is the wordplay.
'spirit' becomes 'imp' (I have seen 'Evil spirit ' mean 'imp' so perhaps 'spirit' could also mean 'imp').
'served with' says to put letters next to each other.
'old' becomes 'o' (abbreviation).
'spanish wine' becomes 'tent' (type of Spanish wine. I am not sure about the 'spanish' bit.).
'imp'+'o'+'tent'='IMPOTENT'
Can you help me to learn more?
(Other definitions for impotent that I've seen before include "Lacking power" , "Helpless, powerless" , "Ineffective" , "Powerless like mon petit" , "Mon petit may be powerless" .)