They appear in recital to sing (5)
I believe the answer is:
altos
'they' is the definition.
Both the definition and answer are plural nouns.
Maybe there's a link between them I don't understand?
'appear in recital to sing' is the wordplay.
'appear in' indicates a hidden word (I've seen 'appearing in' mean this).
'ALTOS' can be found hidden inside 'recital to sing'.
Can you help me to learn more?
(Other definitions for altos that I've seen before include "Choir members" , "Highest male, lowest female, voices" , "High male or low female voices" , "Lowest female singing voices" , "Singers" .)