Utterance of a bachelor on fishing lunch (3)
I believe the answer is:
bah
'utterance of a bachelor on fishing lunch' is the definition.
I can't tell whether this defines the answer.
'of a bachelor on fishing lunch' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'bachelor' becomes 'B' (abbreviation e.g. BA=Bachelor of Arts).
'on fishing lunch' becomes 'h' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'b'='ab'
'ab' is an anagram of 'ba'.
'ba'+'h'='BAH'
Can you help me to learn more?
(Other definitions for bah that I've seen before include "Comic expression of contempt" , "Expression of disgust or contempt" , "Appalling!" , "Exclamation of disgust or annoyance" , "''...! Humbug!'' (Scrooge)" .)