Where workers may be seen in High Barnet (7)
I believe the answer is:
beehive
'in high barnet' is the definition.
The definition suggests a singular noun which matches the answer.
'where workers may be' is the wordplay.
I cannot quite see how this works, but
'be' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'seen' acts as a link.
Can you help me to learn more?
(Other definitions for beehive that I've seen before include "place of business" , "Hairstyle; source of honey" , "Where to find comb" , "Structure in an apiary" , "Habitat of apians" .)