Acidity level too unclear in darkroom product (5)
I believe the answer is:
photo
'darkroom product' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'acidity level too unclear in' is the wordplay.
'acidity level' becomes 'ph' ().
'unclear' is an anagram indicator.
'in' indicates putting letters inside.
'too' anagrammed gives 'oto'.
'ph' going within 'oto' is 'PHOTO'.
Can you help me to learn more?
(Other definitions for photo that I've seen before include "In brief, a snapshot" , "This race finish is very close" , "Snap, picture" , "Pic (abbr)" , "Picture, in short" .)