5 across
Substitute
case
of
stout
with
case
of
brandy
(5-2)
Substitute case of stout with case of brandy (5-2)
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The definition is at the beginning of the clue.
How the clue works
Right, so Substitute is the definition here, that's your reserve or standby option. Now for the build: take the outer letters (the "case") of "stout" and you get ST, chuck in "with" as AND, then take the outer letters (case) of "brandy" to get BY — string ST, AND and BY together and you've got the answer, hyphen and all.