Amiable lady disheartened by Friday finish (8)
I believe the answer is:
friendly
'amiable' is the definition.
(I've seen this before)
'lady disheartened by friday finish' is the wordplay.
'disheartened' says to hollow out the word (remove centre letters).
'by' means one lot of letters go next to another.
'friday' becomes 'fri' ('Fri' can be a synonym of 'friday').
'finish' becomes 'end' ('end' can be a synonym of 'finish'**).
'lady' with its centre taken out is 'ly'.
'fri'+'end'='friend'
'ly' after 'friend' is 'FRIENDLY'.
(Other definitions for friendly that I've seen before include "such a society" , "Affable" , "Amicable and kindly" , "Amicable, favourably disposed" , "Sociable" .)