God in Wordsworth's first poem given name (5)
I believe the answer is:
woden
'god' is the definition.
(I know that Woden is a Anglo-Saxon deity)
'wordsworth's first poem given name' is the wordplay.
'wordsworth's first' becomes 'w' (1st letter of 'wordsworth').
'poem' becomes 'ode' (ode is a type of poem).
'given' says to put letters next to each other.
'name' becomes 'n' (common abbreviation e.g. on forms).
'w'+'ode'+'n'='WODEN'
'in' is the link.
(Other definitions for woden that I've seen before include "Norse god" , "godlike figure" , "Odin" , "Foremost Anglo-Saxon god" .)