Crossword Genius

Batman's sidekick broke biro on first night (5)

Ross

I believe the answer is:

robin

'batman's sidekick' is the definition.
(I've seen this in another clue)

'broke biro on first night' is the wordplay.
'broke' is an anagram indicator.
'on' is a charade indicator (letters next to each other).
'first night' becomes 'n' (1st letter of 'night').
'biro' anagrammed gives 'robi'.
'robi'+'n'='ROBIN'

(Other definitions for robin that I've seen before include "Bird; Batman's aide" , "So-called outlaw" , "Batman and --" , "Batman's assistant" , "Bird - one in Lincoln green?" .)

I've seen this clue in The Mirror.
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