Crossword Genius

In favour of them providing a preface (5)

Ross

I believe the answer is:

proem

'a preface' is the definition.
(thesaurus)

'in favour of them' is the wordplay.
'in favour of' becomes 'pro' (I've seen this before).
'them' becomes 'em'.
'pro'+'em'='PROEM'

'providing' acts as a link.

(Other definitions for proem that I've seen before include "introduction" , "Prelude" , "Preliminary part" , "introductory piece" .)

I've seen this clue in the Evening Standard.
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