Good worker everyone held to be brave and chivalrous (7)
I believe the answer is:
gallant
'be brave and chivalrous' is the definition.
(I've seen this before)
'good worker everyone held' is the wordplay.
'good' becomes 'g' (abbreviation).
'worker' becomes 'ant' (worker is a type of ant).
'everyone' becomes 'all' (I've seen this before).
'held' is an insertion indicator.
'g'+'ant'='gant'
'gant' going around 'all' is 'GALLANT'.
'to' acts as a link.
(Other definitions for gallant that I've seen before include "Dashing, debonair young man" , "Flirt" , "Courtly" , "Bold" , "Brave; courteous" .)