British individual is Star Trek character (5)
I believe the answer is:
bones
'trek character' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'british individual is star' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'individual' becomes 'one' (an individual is one person).
'is star' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'b'+'one'+'s'='BONES'
Can you help me to learn more?
(Other definitions for bones that I've seen before include "Elements of a skeleton" , "Components of skeletons" , "Nickname for a doctor" , "Structural supports for the body" , "... skeletons, perhaps" .)