Morning dress? (3-2)
I believe the answer is:
get-up
'dress?' is the definition.
(getting up is a kind of dressing)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for get-up that I've seen before include "Outfit" , "Style of dress" , "Jump out of bed" , "Unusual or elaborate costume" .)