Crossword Genius

Substance found in mass on Dart (6)

Ross

I believe the answer is:

marrow

'substance' is the definition.
(marrow is a kind of substance)

'mass on dart' is the wordplay.
'mass' becomes 'm' (symbol used in Physics e.g. f=ma).
'on' means one lot of letters go next to another.
'dart' becomes 'arrow' (I've seen this before).
'm'+'arrow'='MARROW'

'found in' is the link.

(Other definitions for marrow that I've seen before include "Large courgette" , "one of two" , "Fatty stuff in bones, or a vegetable gourd" , "Large green squash" , "Stuff found inside bones" .)

I've seen this clue in The Sun.
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