Musician's party crowded? Very much so! (3-6)
I believe the answer is:
jam-packed
This clue could be a double definition.
'musician's party' is the first definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'crowded? very much so' is the second definition.
'jam packed' can be an answer for 'crowded?' (thesaurus). I am unsure of the 'very much so' bit.
Can you help me to learn more?
(Other definitions for jam-packed that I've seen before include "Extremely crowded" , "Heaving" , "Stuffed" , "Chock-a-block" , "Completely full" .)