New runabout's taking on a trailer (7)
I believe the answer is:
arbutus
'a trailer' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'new runabout's taking on' is the wordplay.
'new' is an anagram indicator.
'taking' indicates named letters should be taken away (take can mean remove or delete).
'runabouts' with 'on' removed is 'ruabuts'.
'ruabuts' is an anagram of 'ARBUTUS'.
Can you help me to learn more?
(Other definitions for arbutus that I've seen before include "Evergreen tree or shrub with strawberry-like fruits" , "Evergeen" , "Strawberry-tree" , "But Ursa could become a strawberry tree" , "Plant" .)