Crossword Genius

Make a mistake getting schoolchildren upset (4,2)

Ross

I believe the answer is:

slip up

'make a mistake' is the definition.
(slipping up is a kind of making a mistake)

'schoolchildren upset' is the wordplay.
'schoolchildren' becomes 'pupils' (I've seen this before).
'upset' says the letters should be written in reverse.
'pupils' backwards is 'SLIP-UP'.

'getting' is the link.

(Other definitions for slip up that I've seen before include "Make a mistake, being unsteady on feet?" , "one fielder close to the wicket?" , "Pupils (anag.)" , "get it wrong" , "Small error" .)

I've seen this clue in The Telegraph.
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