It can look nice even when badly lit up (5)
I believe the answer is:
tulip
'it can look nice even' is the definition.
The definition suggests a singular noun which matches the answer.
'badly lit up' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'lit'+'up'='litup'
'litup' anagrammed gives 'TULIP'.
'when' is the link.
Can you help me to learn more?
(Other definitions for tulip that I've seen before include "Spring-blooming plant" , "Flower of the Netherlands" , "cause of mania once" , "Perennial bulb" , "(Dutch) bloom" .)