Party in power that tends, mostly, to waver (5,3,4,3)
I believe the answer is:
paint the town red
'party' is the definition.
Both the definition and answer are adjectives.
Perhaps they are linked in a way I don't understand?
'in power that tends mostly to waver' is the wordplay.
'mostly' means to remove the last letter.
'to waver' is an anagram indicator (I've seen 'wavering' mean this).
'in'+'power'+'that'+'tends'='inpowerthattends'
'inpowerthattends' with its final letter removed is 'inpowerthattend'.
'inpowerthattend' anagrammed gives 'PAINT THE TOWN RED'.
Can you help me to learn more?
(Other definitions for paint the town red that I've seen before include "Go on a pub crawl" , "Celebrate" , "enjoy celebration" , "get rid of the blues?" .)