Beheaded chap finds wharf in better mood (7)
I believe the answer is:
happier
'better mood' is the definition.
'happier' can be an answer for 'better' (thesaurus). I am not certain of the 'mood' bit.
'beheaded chap finds wharf' is the wordplay.
'beheaded' means to remove the first letter (the head of the word is removed).
'finds' says to put letters next to each other.
'wharf' becomes 'pier' (I've seen this before).
'chap' with its initial letter taken away is 'hap'.
'hap'+'pier'='HAPPIER'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for happier that I've seen before include "Gladder" , "More cheerful" , "More joyful" .)