Crossword Genius

What makes middle of cell right after fresh clean out (9)

Ross

I believe the answer is:

nucleator

'what makes middle of cell' is the definition.
(something which helps create a nucleus)

'right after fresh clean out' is the wordplay.
'right' becomes 'r' (common abbreviation).
'after' means one lot of letters go next to another.
'fresh' indicates anagramming the letters.
'clean'+'out'='cleanout'
'cleanout' is an anagram of 'nucleato'.
'r' after 'nucleato' is 'NUCLEATOR'.

I've seen this clue in The Guardian.
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