double duty

noun2

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
2. •
   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