Grubby, like a pomegranate ... (5)
I believe the answer is:
seedy
I believe this clue is a double definition.
'grubby' is the first definition.
(thesaurus)
'like a pomegranate' is the second definition.
(I've seen this in another clue)
(Other definitions for seedy that I've seen before include "Scruffy" , "Unseemly" , "run down" , "Run-down, squalid" , "Shabby and a bit dubious" .)