Prepare for party with various reds to drink (5,2)
I believe the answer is:
dress up
'prepare for' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps you can see an association between them that I don't see?
'with various reds to drink' is the wordplay.
I cannot quite see how this works, but
an anagram of 'reds' is 'dres' which is within the answer.
'drink' could be 'sup' (to sup is to drink) and 'sup' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'party' acts as a link.
Can you help me to learn more?
(Other definitions for dress up that I've seen before include "Put on the glad rags" , "Masquerade" , "Put on best clothes - put on fancy dress - improve appearance of" , "Adorn" , "Put on fancy clothing" .)