It's great to be back from Gibraltar! (3)
I believe the answer is:
big
This could be a double definition.
'it's great' is the first definition.
(synonyms)
'back from gibraltar' is the second definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?
'to be' is the link.
Can you help me to learn more?
(Other definitions for big that I've seen before include "oversized" , "Large or substantial" , "Important" , "Circus tent" , "Sizeable" .)