Briefly cheer up worker in Nice (8)
I believe the answer is:
pleasant
'nice' is the definition.
(associated in meaning)
'briefly cheer up worker' is the wordplay.
'briefly' means to remove the last letter.
'cheer up' becomes 'please' (I've seen this before).
'worker' becomes 'ant' (worker is a type of ant).
'please' with its last letter taken away is 'pleas'.
'pleas'+'ant'='PLEASANT'
'in' acts as a link.
(Other definitions for pleasant that I've seen before include "Lovely" , "Satisfying, likeable" , "Enjoyable, agreeable" , "Affable, good-humoured" , "Refreshing" .)