Crossword Genius

In particular, pieces rewritten by friend (10)

Ross

I believe the answer is:

especially

'in particular' is the definition.
('especially' can be a synonym of 'in particular')

'pieces rewritten by friend' is the wordplay.
'rewritten' is an anagram indicator.
'by' is a charade indicator (letters next to each other).
'friend' becomes 'ally' (I've seen this before).
'pieces' with letters rearranged gives 'especi'.
'especi'+'ally'='ESPECIALLY'

(Another definition for especially that I've seen is " In particular".)

I've seen this clue in The Telegraph.
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