Local jam served up with alcoholic spirit (4)
I believe the answer is:
marc
'alcoholic spirit' is the definition.
'marc' can be an answer for 'spirit' (I've seen this before). I am not sure about the 'alcoholic' bit.
'local jam served up' is the wordplay.
'local' becomes 'c' (I am not sure about this - if you are sure you should believe this answer much more).
'jam' becomes 'ram' (synonyms).
'served up' is a reversal indicator (in a down clue, going upwards).
'c'+'ram'='cram'
'cram' backwards is 'MARC'.
'with' is the link.
Can you help me to learn more?
(Other definitions for marc that I've seen before include "Type of brandy" , "Type of eau-de-vie made from residue of grapes" , "Spirit" , "Brandy made from fruit-refuse" , "Strong liquor" .)