In a poor state getting bad wound in the navy (3-4)
I believe the answer is:
run-down
'in a poor state' is the definition.
'bad wound in the navy' is the wordplay.
'bad' indicates an anagram.
'in the' indicates putting letters inside.
'navy' becomes 'rn' (abbreviation for Royal Navy).
'wound' with letters rearranged gives 'undow'.
'undow' going within 'rn' is 'RUN-DOWN'.
'getting' is the link.
(Other definitions for run-down that I've seen before include "Worn-out" , "Shabby" , "Exhausted" , "Dilapidated" , "Tired - unwell" .)