Diet also poor in lonely place (8)
I believe the answer is:
isolated
'diet also poor in lonely place' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I don't see?
'diet also poor' is the wordplay.
'poor' indicates an anagram.
'diet'+'also'='dietalso'
'dietalso' anagrammed gives 'ISOLATED'.
Can you help me to learn more?
(Other definitions for isolated that I've seen before include "Remote; lonely" , "Quarantined, alone" , "Remote, set apart" , "Alone, set apart" , "Cut off or left behind" .)