Store ammo haphazardly in humid location (5,4)
I believe the answer is:
steam room
'humid location' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'store ammo haphazardly' is the wordplay.
'haphazardly' indicates an anagram.
'store'+'ammo'='storeammo'
'storeammo' is an anagram of 'STEAM ROOM'.
'in' is the link.
Can you help me to learn more?
(Other definitions for steam room that I've seen before include "Vapour bath -- more atoms (anag)" , "sauna" .)