Following last month, lawyer is in contact with them - there are several sides to this (7)
I believe the answer is:
decagon
'them there are several sides to this' is the definition.
The definition suggests a singular noun which matches the answer.
'following last month lawyer is in contact with' is the wordplay.
'following' means one lot of letters go next to another.
'last month' becomes 'dec' (short for December, last month of the year).
'lawyer' becomes 'ag' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'is in contact with' becomes 'on' (to be on something is to be touching it).
'dec' put next to 'ag' is 'decag'.
'decag'+'on'='DECAGON'
Can you help me to learn more?
(Other definitions for decagon that I've seen before include "Ten-sided shape" , "A polygon -- eg can-do (anag)" , "10-sided figure" , "Go, dance on geometric figure with ten sides" , "Figure with 10 sides" .)