American swimming privately (2,6)
I believe the answer is:
in camera
'privately' is the definition.
(I've seen this before)
'american swimming' is the wordplay.
'swimming' indicates anagramming the letters (letters swim around into a new order).
'american' anagrammed gives 'IN CAMERA'.
(Other definitions for in camera that I've seen before include "Kept private (law)" , "Where you find digital pictures" , "under wraps" , "'In private (2,6)'" , "not for all to see" .)