Central to shepherds and oddly irenic — it's how Pan is (7)
I believe the answer is:
hircine
'how pan is' is the definition.
I can't tell whether this definition defines the answer.
'central to shepherds and oddly irenic' is the wordplay.
'central' says to take the centre.
'and' says to put letters next to each other.
'oddly' indicates an anagram.
The centre of 'shepherds' is 'h'.
'irenic' anagrammed gives 'ircine'.
'h'+'ircine'='HIRCINE'
'it's' acts as a link.
Can you help me to learn more?
(Another definition for hircine that I've seen is " like nanny".)