Could he possibly harp about an inexperienced driver? (5)
I believe the answer is:
ralph
'could he' is the definition.
The definition suggests a singular noun which matches the answer.
'possibly harp about an inexperienced driver?' is the wordplay.
'possibly' indicates an anagram.
'about' means one lot of letters goes inside another.
'an inexperienced driver?' becomes 'l' (as in L-plates for learner drivers).
'harp' is an anagram of 'raph'.
'raph' placed around 'l' is 'RALPH'.
Can you help me to learn more?
(Other definitions for ralph that I've seen before include "man" , "Piggy's friend (Lord of the Flies); --- Vaughan Williams" , "--- Waldo Emerson, US writer" , "Boy's name" , "- Vaughan Williams, English composer" .)