No-frills razor supplier subsumes a second (5)
I believe the answer is:
basic
'no-frills' is the definition.
(I've seen this before)
'razor supplier subsumes a second' is the wordplay.
'razor supplier' becomes 'bic' (I can't explain this - if you can you should believe this answer much more).
'subsumes' indicates putting letters inside (subsume can mean to absorb).
'second' becomes 's' (common abbreviation).
'a'+'s'='as'
'bic' going around 'as' is 'BASIC'.
Can you help me to learn more?
(Other definitions for basic that I've seen before include "Fundamental instruction's" , "Unembellished" , "Fundamental, underlying" , "Forming a foundation" , "Simple form of language" .)