Crossword Genius

Book reckless forward (5)

Ross

I believe the answer is:

brash

'forward' is the definition.
(both can mean confident or arrogant)

'book reckless' is the wordplay.
'book' becomes 'b' (abbreviation for book).
'reckless' becomes 'rash' (synonyms).
'b'+'rash'='BRASH'

(Other definitions for brash that I've seen before include "Audacious" , "Annoyingly self-assertive" , "Cocksure" , "Vulgarly self-assertive, impudent" , "Offensively loud" .)

I've seen this clue in The Telegraph and The Sun.
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