Recycled air - thirst developed pain (9)
I believe the answer is:
arthritis
'developed pain' is the definition.
'arthritis' can be an answer for 'pain' (I have seen 'Joint pain ' mean 'arthritis' so perhaps 'pain' could also mean 'arthritis'). I am not sure about the 'developed' bit.
'recycled air thirst' is the wordplay.
'recycled' indicates anagramming the letters.
'air'+'thirst'='airthirst'
'airthirst' is an anagram of 'ARTHRITIS'.
Can you help me to learn more?
(Other definitions for arthritis that I've seen before include "Inflammatory disease of the joints" , "Inflammation of joints" , "complaint" , "Joint pain" .)