Stage in development of some workers at home getting sign of approval (6)
I believe the answer is:
instar
'stage in development of some workers' is the definition.
(phase in the growth of insects - eg worker bees)
'home getting sign of approval' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'getting' says to put letters next to each other.
'sign of approval' becomes 'star' (eg a gold star from a teacher).
'in'+'star'='INSTAR'
'at' is the link.
(Other definitions for instar that I've seen before include "Form of insect" , "Small creature" , "Developmental stage" .)