Crossword Genius

Letter to a girl, in fact (5)

Ross

I believe the answer is:

truth

'in fact' is the definition.
(thesaurus)

'letter to a girl' is the wordplay.
'letter' becomes 't'.
'to a girl' becomes 'ruth' (girl's name).
't'+'ruth'='TRUTH'

(Other definitions for truth that I've seen before include "Honesty" , "Belief accepted as correct" , "known facts" , "Candour" , "Verity" .)

I've seen this clue in the Evening Standard.
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