Plant possibly lit up (5)
I believe the answer is:
tulip
'plant' is the definition.
The answer is an example.
'possibly lit up' is the wordplay.
'possibly' indicates anagramming the letters.
'lit'+'up'='litup'
'litup' is an anagram of 'TULIP'.
(Other definitions for tulip that I've seen before include "Liliaceous plant with a spring flower" , "Spring-flowering plant" , "Bloomer" , "Popular garden flower from Amsterdam?" , "Flower - lit up (anag)" .)