5 down
A
penny
accepted
by
ticket
seller
to
leave
the
Tube
(3,3)
A penny accepted by ticket seller to leave the Tube (3,3)
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The definition is at the end of the clue.
How the clue works
Right, so to leave the Tube is your definition there — that's the tapping out you do at the barrier on the Underground. For the wordplay, take TOUT (that's your ticket seller) and slot A (a) plus P (penny) inside it, giving you T-A-P-OUT.