Globe theatre in trouble when margins dropped (5)
I believe the answer is:
earth
'globe' is the definition.
(synonyms)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for earth that I've seen before include "Fox's burrow" , "our home" , "our present abode" , "It is necessary to clear" , "brownish pigment?" .)