Suspicion about entering sauna? (6)

I believe the answer is:
breath
'suspicion' is the definition.
(I've seen this in other clues)
'about entering sauna?' is the wordplay.
'about' is an insertion indicator.
'entering' becomes 're' (I've seen this in other clues).
'sauna?' becomes 'bath' (I am not sure about this - if you are sure you should believe this answer much more).
're' inserted into 'bath' is 'BREATH'.
Can you help me to learn more?
(Other definitions for breath that I've seen before include "Air drawn in and expelled out" , "from which inspiration may be drawn" , "Air that's inhaled and exhaled" , "Bather (anag.)" , "Intake of air" .)
