He shows there can be money in a harp composition (5)
I believe the answer is:
ralph
'he shows there can' is the definition.
The definition suggests a singular noun which matches the answer.
'money in a harp composition' is the wordplay.
'money' becomes 'l' (L can mean 'pounds').
'in' means one lot of letters goes inside another.
'composition' indicates anagramming the letters (letters arranged or composed in a different order).
'harp' anagrammed gives 'raph'.
'l' inserted within 'raph' is 'RALPH'.
'be' acts as a link.
Can you help me to learn more?
(Other definitions for ralph that I've seen before include "Boy's name" , "Piggy's friend (Lord of the Flies); --- Vaughan Williams" , "American poet and essayist" , "man" , "Fellow's name" .)