Make several arrangements for each person unable to speak (7)
I believe the answer is:
permute
'make several arrangements' is the definition.
(make several permutations)
'each person unable to speak' is the wordplay.
'each person' becomes 'per' (abbreviation. I am not sure about the 'each' bit.).
'unable to speak' becomes 'mute' (I've seen this before).
'per'+'mute'='PERMUTE'
'for' is the link.
Can you help me to learn more?
(Other definitions for permute that I've seen before include "Rearrange" , "Change sequence of" , "Shuffle order of" .)