Poorly, claimed for health check (7)
I believe the answer is:
medical
'health check' is the definition.
('medical' can be a synonym of 'health check')
'poorly claimed' is the wordplay.
'poorly' indicates anagramming the letters (I've seen this in other clues).
'claimed' is an anagram of 'MEDICAL'.
'for' acts as a link.
(Other definitions for medical that I've seen before include "Examination of physical health" , "Relating to doctoring" , "Thorough health check" , "Doctor's test" , "examination carried out by a doctor" .)