Describes in detail, how second fellow got ten quid (8)
I believe the answer is:
expounds
'describes in detail how second' is the definition.
I can't judge whether this defines the answer.
'fellow got ten quid' is the wordplay.
'fellow' becomes 'es' (I am not sure about this - if you are sure you should believe this answer much more).
'got' is an insertion indicator.
'ten' becomes 'X' (Roman numeral).
'quid' becomes 'pound' (synonyms).
'x'+'pound'='xpound'
'es' placed around 'xpound' is 'EXPOUNDS'.
Can you help me to learn more?
(Other definitions for expounds that I've seen before include "Interprets" , "Sets forth or explains in detail" .)