Elderly and still in that beastly place! (7)
I believe the answer is:
seventy
'elderly' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I don't see?
'still in that beastly place' is the wordplay.
'still' becomes 'even' (synonyms).
'in' is an insertion indicator.
'that beastly place' becomes 'sty' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'even' placed inside 'sty' is 'SEVENTY'.
'and' is the link.
Can you help me to learn more?
(Other definitions for seventy that I've seen before include "A number" , "LXX" , "Threescore and ten" , "Three score years and ten" .)