Harry cried - pet's old and feeble (8)
I believe the answer is:
decrepit
'old and feeble' is the definition.
(I've seen this before)
'harry cried pet's' is the wordplay.
'harry' indicates an anagram (I've seen this in other clues).
'cried'+'pet'='criedpet'
'criedpet' is an anagram of 'DECREPIT'.
(Other definitions for decrepit that I've seen before include "Worn out by age or use" , "Pet cried (anag) - worn out" , "like a crate?" , "rickety" , "Depicter in state of dilapidation" .)