Re missing variety of grubbiness (9)
I believe the answer is:
griminess
'grubbiness' is the definition.
(synonyms)
're missing variety' is the wordplay.
'variety' indicates anagramming the letters.
're'+'missing'='remissing'
'remissing' anagrammed gives 'GRIMINESS'.
'of' acts as a link.
(Other definitions for griminess that I've seen before include "Quality of coal" , "Amount of muck" .)