Mass following in Estonia for engineering publication (9)
I believe the answer is:
manifesto
'publication' is the definition.
(I have seen 'A publication' mean 'manifesto' so perhaps 'publication' could also mean 'manifesto')
'mass following in estonia for engineering' is the wordplay.
I cannot really see how this works, but
'mass' could be 'm' (symbol used in Physics e.g. f=ma) and 'm' is present in the answer.
'following' could be 'f' (used when citing page numbers etc) and 'f' is found within the answer.
an anagram of 'estonia' is 'aniesto' which is present in the left over letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for manifesto that I've seen before include "Planks assembled here" , "statement of policy" , "Declaration of political programme" , "Public declaration of intent" , "Publication containing political programme" .)