Most pine grievously for assistance from relative (8)
I believe the answer is:
nepotism
'assistance from relative' is the definition.
The answer and definition can be both acts as well as being singular nouns.
I also know that 'relative' relates to this answer.
'most pine grievously' is the wordplay.
'most pine' can be anagrammed to 'NEPOTISM'.
Though, I am not sure how this is indicated.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for nepotism that I've seen before include "Favouritism shown in hiring relatives" , "Showing favour" , "keeping it in the family" , "Fixing up the relatives with good jobs" , "The favouring of relatives or friends for jobs, etc" .)