Numbers of solutions including old slang turned up in print (10)
Definition
print
Wordplay type
Reversal
Explanation
This took a while to parse: I was sure it must refer to numbers of solutions in the puzzle but finally realised it’s PH PH [ the numbers indicating the acidity / alkalinity of a solution ] round [including] O [old] + a reversal [turned up] of ARGOT [slang]
Source: Fifteensquared
Answer
PHOTOGRAPH