Suspicion bug's first about at hospital (6)
I believe the answer is:
breath
'suspicion' is the definition.
(I've seen this in other clues)
'bug's first about at hospital' is the wordplay.
'first' indicates taking the first letters.
'about' becomes 're' (regarding**).
'hospital' becomes 'h'.
The initial letter of 'bugs' is 'b'.
'b'+'re'+'at'+'h'='BREATH'
(Other definitions for breath that I've seen before include "Air received and expelled" , "from which inspiration may be drawn" , "Bertha (anag.)" , "It is drawn all the time" , "An inhalation and exhalation" .)