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Have boobs, on backward students (4,2)

Ross

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4,2

6*

slip up

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'have boobs on' is the definition.
I can't tell whether this defines the answer.

'backward students' is the wordplay.
'backward' says the letters should be written backwards.
'students' becomes 'pupils' ('pupil' can be a synonym of 'student').
'pupils' in reverse letter order is 'SLIP-UP'.

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(Other definitions for slip up that I've seen before include "get it wrong" , "Informally, make a mistake - lose footing?" , "Minor inadvertent mistake" , "Small error" , "Pupils (anag.)" .)

I've seen this clue in the Evening Standard.
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