What does the cryptic crossword clue "Pocketed by OAP, age-related communications device (5)" mean?

The definition is "device". The wordplay uses a hidden word. Hidden in "pocketed by oaP, AGE-Related communications device" The answer is Pager.

Pocketed by OAP, age-related communications device (5)

Telegraph Prize Cryptic #3049 | 21 Across | 2020-03-29 flower