Active users of both car and boats (8)
I believe the answer is:
acrobats
'active users' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps you can see a link between them that I can't see?
'both car and boats' is the wordplay.
I cannot quite see how this works, but
an anagram of 'car' is 'acr' which is located in the answer.
an anagram of 'boats' is 'obats' which is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for acrobats that I've seen before include "Circus peformers" , "Circus athletes or gymnasts" , "Gymnastic entertainers" , "Circus tumblers" , "Circus folk" .)