Crossword Genius

Field that has concrete mass (5)

Ross

I believe the answer is:

realm

'field' is the definition.
(synonyms)

'concrete mass' is the wordplay.
'concrete' becomes 'real' (similar in meaning).
'mass' becomes 'm' (symbol used in Physics e.g. f=ma).
'real'+'m'='REALM'

'that has' acts as a link.

(Other definitions for realm that I've seen before include "monarch's responsibility" , "Knowledge base" , "Kingdom could be lamer" , "Kingdom's" , "Peers are possessed by this" .)

I've seen this clue in The Times.
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