Catches reviews of characters in The West End (4)
I believe the answer is:
nets
'catches' is the definition.
(netting is a kind of catching)
'reviews of characters in the west end' is the wordplay.
'reviews of' says the letters should be written in reverse (I've seen 'review' mean this).
'characters in' indicates the answer is hidden within the clue.
'sten' is hidden in the letters of 'west end'.
'sten' reversed gives 'NETS'.
(Other definitions for nets that I've seen before include "Practice pitches (cricket)" , "Catches (fish)" , "puts ball into goal" , "(Period for) cricket practice" , "Traps, to catch fish say" .)