17 across
Hat
is
miserable,
lacking
will
ultimately
to
inspire
(5)
Hat is miserable, lacking will ultimately to inspire (5)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
"Hat is" contracts to I'M, giving the first bit. Then take BLUE for miserable and drop the L — the last letter (ultimately) of "will" is what's lacking — leaving BUE. Stick them together for IMBUE, meaning to inspire.