14 across
Fit
after
work
out,
not
too
expensive
(10)
Fit after work out, not too expensive (10)
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The definition is at the end of the clue.
How the clue works
Look at not too expensive at the end — that's your definition. For the wordplay, reason means "work out" (as in figure something out), and you stick able (fit) after it, giving you REASON followed by ABLE.