Dive inside with vital suppliers (5)
I believe the answer is:
veins
'vital suppliers' is the definition.
Although both the answer and definition are plural nouns, I can't see how they can define each other.
'dive inside with' is the wordplay.
'with' indicates a hidden word.
'VEINS' can be found hidden inside 'dive inside'.
Can you help me to learn more?
(Other definitions for veins that I've seen before include "Circulation aids" , "Blood vessels" , "Characteristic styles" , "Layers of ore" .)