A summons will get the man to move in anguish (6)
I believe the answer is:
writhe
'move in anguish' is the definition.
'writhe' can be an answer for 'anguish' (thesaurus). I am unsure of the 'move in' bit.
'a summons will get the man' is the wordplay.
'a summons' becomes 'writ' (I've seen this before).
'will get' says to put letters next to each other.
'the man' becomes 'he' (he refers to a man).
'writ'+'he'='WRITHE'
'to' is the link.
Can you help me to learn more?
(Other definitions for writhe that I've seen before include "Contort in pain" , "Twist in agony" , "Squirm in pain" , "6, maybe in agony" , "Struggle" .)