Accent associated with fellow extremely unhelpful and trying (9)
I believe the answer is:
stressful
'trying' is the definition.
(I know that trying can be written as stressful)
'accent associated with fellow extremely unhelpful' is the wordplay.
'accent' becomes 'stress' (stress is a kind of accent).
'associated with' says to put letters next to each other.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'extremely' suggests removing the centre (only the extremes of the word are used).
'unhelpful' with its middle taken out is 'ul'.
'stress'+'f'+'ul'='STRESSFUL'
'and' acts as a link.
(Other definitions for stressful that I've seen before include "Creating tension" , "tense" , "under great pressure" , "Causing mental tension" , "Worrying" .)