Crossword Genius

Catch some up (4)

Ross

I believe the answer is:

trap

'catch' is the definition.
(trapping is a kind of catching)

'some up' is the wordplay.
'some' becomes 'part' (only part of something).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'part' backwards is 'TRAP'.

(Other definitions for trap that I've seen before include "Gin - hidden danger" , "get in net" , "Vehicle" , "website?" , "Deceive" .)

I've seen this clue in The Telegraph.
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