Temporarily stop America blocking outlay (7)
I believe the answer is:
suspend
'temporarily stop' is the definition.
(suspend can mean to stop for a period of time)
'america blocking outlay' is the wordplay.
'america' becomes 'U.S.' (abbreviation for the United States).
'blocking' means one lot of letters goes inside another.
'outlay' becomes 'spend' (I've seen this before).
'us' going into 'spend' is 'SUSPEND'.
(Other definitions for suspend that I've seen before include "Hang freely" , "Delay" , "Carry out hanging" , "Hang - discontinue" , "Hold up or dangle" .)