Crossword Genius

Endorsement of commercial choice (8)

Ross

I believe the answer is:

adoption

'endorsement' is the definition.
(I've seen this before)

'commercial choice' is the wordplay.
'commercial' becomes 'ad' (abbreviation for advertisement).
'choice' becomes 'option' (synonyms).
'ad'+'option'='ADOPTION'

'of' is the link.

(Other definitions for adoption that I've seen before include "how to create a family" , "Espousal, a fostering" , "formal selection of candidate?" , "approval" , "Taking-on, acceptance" .)

I've seen this clue in The Guardian.
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