Choose angle for tossing coins? (5,6)
I believe the answer is:
'coins?' is the definition.
'choose angle for tossing' is the wordplay.
'for tossing' indicates anagramming the letters (letters tossed around).
'chooseangle' is an anagram of 'LOOSE CHANGE'.
(Other definitions for loose change that I've seen before include "little cash!" , "Coins kept for casual use" .)