Poor health for partner (5,4)
I believe the answer is:
other half
'partner' is the definition.
(I've seen this before)
'poor health for' is the wordplay.
'poor' indicates anagramming the letters.
'health'+'for'='healthfor'
'healthfor' anagrammed gives 'OTHER HALF'.
(Other definitions for other half that I've seen before include "people better off than us?" , "Dutch" , "Spouse" , "Wife or hubby" , "partner" .)