The most common and most likely answer to this crossword clue is the 5 letter word ROSE*
I've seen this crossword clue in The Guardian
R
O
S
E
*
Buddy explains!
The straight part
We know that "What’s got out of bed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what’s got out of bed = rose*.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ROSE* mean?
ROSE* noun- A shrub of the genus Rosa, with red, pink, white or yellow flowers.
- A flower of the rose plant.
- A plant or species in the rose family. (Rosaceae)
- Something resembling a rose flower.
- The rose flower, usually depicted with five petals, five barbs, and a circular seed.
- A purplish-red or pink colour, the colour of some rose flowers.
- A round nozzle for a sprinkling can or hose.
- The base of a light socket.
- Any of various large, red-bodied, papilionid butterflies of the genus Pachliopta.
- Any of various flower-like polar graphs of sinusoids or their squares.
- A graph with only one vertex.
- To make rose-coloured; to redden or flush.
- To perfume, as with roses.
- Having a purplish-red or pink colour. See rosy.
- To move, or appear to move, physically upwards relative to the ground.
- To increase in value or standing.
- To begin; to develop.
- To go up; to ascend; to climb.
- To cause to go up or ascend.
- To retire; to give up a siege.
- To come; to offer itself.
- To be lifted, or capable of being lifted, from the imposing stone without dropping any of the type; said of a form.
- A pale pink wine made by removing the dark grape skins at the required point during fermentation.