Change is overt, possibly -- this'll bear a change (9,4)
I believe the answer is:
overnight case
'this'll bear a change' is the definition.
I can't judge whether this defines the answer.
'change is overt possibly' is the wordplay.
'possibly' indicates anagramming the letters.
'change'+'is'+'overt'='changeisovert'
'changeisovert' anagrammed gives 'OVERNIGHT CASE'.
Can you help me to learn more?
(Other definitions for overnight case that I've seen before include "Bag" , "It may be packed" , "One has brief stay in hospital" , "Small item of luggage" , "Item of luggage for short stay" .)