Crossword Genius

They might do you harm at prep school after Piggott enters (12)

Ross

I believe the answer is:

cholesterols

'they might do you harm' is the definition.

'prep school after piggott enters' is the wordplay.
'prep' is an anagram indicator (letters must be prepared differently).
'after piggott' becomes 'lester' (Lester Piggott. I am not sure about the 'after' bit.**).
'enters' means one lot of letters goes inside another.
'school' anagrammed gives 'chools'.
'chools' going around 'lester' is 'CHOLESTEROLS'.

'at' acts as a link.

I've seen this clue in The Guardian.
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