1D Work time? Almost put away handle (7) _P_R_T_
OPERATE? I see can see OP being 'work' and ATE being 'put away' otherwise baffled - help appreciated!...
28a "Quite lacking obstruction, having an erection is relentless (2, 3-2)"
seems to be NO LET-UP but other than UP (obviously!) and the whole thing meaning 'relentless' I can't parse it...!...