Corner between walls and roof on lounge frequently giving way, can be moved (8)

'moved' is the definition.
Both the answer and definition are adjectives.
Perhaps you can see an association between them that I can't see?

'corner between walls and roof on lounge frequently giving way' is the wordplay.
I cannot really understand how this works, but
'roof' could be 'gable' (gable roof is a kind of roof) and 'gable' is present in the answer.
The remaining letters 'lug' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'can be' is the link.

Can you help me to learn more?