9 across
Notice
an
attempt
to
restrict
one,
so
scored
slowly
(6)
Notice an attempt to restrict one, so scored slowly (6)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
The definition is scored slowly — a musical tempo. "Notice" gives you AD, then "an attempt" is A GO, which "restricts" (wraps around) I for "one", giving you AG(I)O = AGIO. Stick AD in front of that and you're done.