Fool in poor abode keeping pecker up (8)
I believe the answer is:
bonehead
'fool' is the definition.
(I know that bonehead is a type of fool)
'poor abode keeping pecker up' is the wordplay.
'poor' indicates an anagram.
'keeping' indicates putting letters inside (some letters kept inside).
'pecker' becomes 'hen' (I've seen this in another clue).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'hen' written backwards gives 'neh'.
'abode' is an anagram of 'boead'.
'boead' enclosing 'neh' is 'BONEHEAD'.
'in' is the link.
(Other definitions for bonehead that I've seen before include "Stupid person with ossified brain" , "dope" , "Stupid person with ossified cranium" , "Fool" , "stupid leader" .)