double-duty

Noun

double duty (countable and uncountable, plural double duties)

1. The performance of two distinct roles simultaneously or the undertaking of work for two people.
   • But if a token phenomenal feel does double duty in this way (as a token of an aspect of both the pain and our way of thinking of the pain), no extra specter of dualism arises.2006 March 23, Dean Zimmerman, Oxford Studies in Metaphysics Volume 2, OUP Oxford, →ISBN, page 22
2. (crosswording) A cryptic device or cluing error whereby a term forms part of both the definition and the wordplay.
   • I find this anagram fascinating, a message from the god of language. Mess serves double duty here, as synonym and as anagram tip-off.1986 10, “Spy”, in (Please provide the book title or journal name), page 61