Learner out of bed getting popular plant (5)
I believe the answer is:
lupin
'plant' is the definition.
The answer is an example.
'learner out of bed getting popular' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'out of bed' becomes 'up' (synonyms).
'getting' says to put letters next to each other.
'popular' becomes 'in' ('in' can mean trendy).
'l'+'up'+'in'='LUPIN'
(Other definitions for lupin that I've seen before include "Tall-spiked plant" , "Plant with flowers on long spikes" , "bloomer" , "Nil up in this flower" , "Pea relative with tall spikes of flowers" .)