13 across
Renewal
letter
includes
payment
aid
(1-6)
Renewal letter includes payment aid (1-6)
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hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
Look at payment aid — that's your definition, pointing to an electronic wallet for digital payments. The clever bit is that the answer is hiding in plain sight inside "Renewal letter" (ren**EWALLET**ter), with "includes" tipping you off that it's a hidden word.