Crossword Genius

Cast-iron commercial progress (6)

Ross

I believe the answer is:

inroad

'progress' is the definition.
(thesaurus)

'cast-iron commercial' is the wordplay.
'cast' indicates an anagram (letters are dispersed or cast around).
'commercial' becomes 'ad' (abbreviation for advertisement).
'iron' anagrammed gives 'inro'.
'inro'+'ad'='INROAD'

(Other definitions for inroad that I've seen before include "Foray" , "Encroachment; hostile attack" , "Encroachment, intrusion" , "Offensive" , "Ordain (anag.)" .)

I've seen this clue in The Guardian.
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