Crossword Genius

Leo, NBC perhaps, is in a mass (2,4)

Ross

I believe the answer is:

en bloc

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'in a mass' is the definition.
I can't judge whether this definition defines the answer.

'leo nbc perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'leo'+'nbc'='leonbc'
'leonbc' is an anagram of 'EN BLOC'.

'is' is the link.

Can you help me to learn more?

(Other definitions for en bloc that I've seen before include "All together - as a whole" , "As a whole (body)" , "As a group (French)" , "As a group (Fr.)" , "in wholesale fashion" .)

I've seen this clue in the Sydney Morning Herald.
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