Crossword Genius

Study once more the advert (4)

Ross

I believe the answer is:

read

'study' is the definition.
(synonyms)

'once more the advert' is the wordplay.
'once more' becomes 're' (prefix in words like 're-emerge' or 're-enter').
'the advert' becomes 'ad' (synonyms).
're'+'ad'='READ'

(Other definitions for read that I've seen before include "Understand written music" , "what follows 18 [OMASUM] in a 17 [RUMINANT]" , "Speak" , "Measure energy or fuel consumption" , "Perused" .)

I've seen this clue in the Evening Standard.
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