In a good position, somewhat, after police operation captures computers (7,6)
I believe the answer is:
sitting pretty
'in a good position' is the definition.
(I've seen this in another clue)
'somewhat after police operation captures computers' is the wordplay.
'somewhat' becomes 'pretty' (I've seen this in another clue).
'after' is a charade indicator (letters next to each other).
'police operation' becomes 'sting' (I've seen this in another clue).
'captures' indicates putting letters inside.
'computers' becomes 'IT' (information technology).
'sting' enclosing 'it' is 'sitting'.
'pretty' put after 'sitting' is 'SITTING PRETTY'.
(Other definitions for sitting pretty that I've seen before include "Enjoying a good position" , "In an enviable position" , "Might supermodel be" , "In a good position (posing as a model?)" , "In a good situation" .)