Crossword Genius

Firm about middle (4)

Ross

I believe the answer is:

core

'middle' is the definition.
(core can mean the centre of something)

'firm about' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'about' becomes 're' (regarding).
'co'+'re'='CORE'

(Other definitions for core that I've seen before include "Central part of the Earth" , "essential element" , "Centre, heart" , "The centre part, as of an apple" , "Drilled rock sample" .)

I've seen this clue in The Mirror.
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