Work almost through — beginning to look cheerful (6)
I believe the answer is:
jovial
'cheerful' is the definition.
(I've seen this before)
'work almost through beginning to look' is the wordplay.
'work almost' becomes 'jo' (I can't justify this - if you can you should believe this answer much more).
'through' becomes 'via' (I've seen this before).
'beginning to' suggests taking the first letters.
The first letter of 'look' is 'l'.
'jo'+'via'+'l'='JOVIAL'
Can you help me to learn more?
(Other definitions for jovial that I've seen before include "Cheerful, lively" , "'Jolly, merry (6)'" , "Full of cheerful good humour" , "Jolly, good-humoured" , "Happy and cheerful" .)