Summon up (5)
'summon up' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for muster that I've seen before include "Assemble for duty" , "a lot of peacocks" , "assembled troops?" , "Bring (troops) together" , "Set rum badly for the calling together of the troops" .)
'summon up' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for evoke that I've seen before include "Bring (a thing) to mind" , "Prompt" , "bring forth" , "Arouse" , "Kindle (memory)" .)