Oddly overlooked, unheard, US dean and poet (6)
I believe the answer is:
neruda
'poet' is the definition.
(poet Pablo Neruda)
'oddly overlooked unheard us dean' is the wordplay.
'oddly overlooked' means one should take alternating letters (letters in odd-numbered positions removed).
'unheard'+'us'+'dean'='unheardusdean'
The alternate letters of 'unheardusdean' are 'NERUDA'.
'and' acts as a link.
(Other definitions for neruda that I've seen before include "S American poet" , "Pablo --, Chilean poet and politician" .)