13 across
Bit
of
cash
made
by
heartless
opponent
(4)
Bit of cash made by heartless opponent (4)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is Bit of cash, referring to the rial, a unit of currency used in Iran and other countries. The wordplay takes RIVAL, meaning "opponent", and removes its central letter (the "heart") — the V — leaving RI-AL, which gives us RIAL. "Heartless" is the indicator telling us to drop the middle letter.