Game requiring select players to hold an ace (7)
I believe the answer is:
canasta
'game' is the definition.
(canasta is a kind of game)
'select players to hold an ace' is the wordplay.
'select players' becomes 'cast' (group of actors. I am not sure about the 'select' bit.).
'to hold' is an insertion indicator.
'ace' becomes 'a'.
'cast' enclosing 'an' is 'canast'.
'canast'+'a'='CANASTA'
'requiring' acts as a link.
Can you help me to learn more?
(Other definitions for canasta that I've seen before include "Form of rummy using two decks of cards and four jokers" , "Card-game, a form of rummy" , "Rummy-like card-game" , "Card game like rummy" , "Game played with two packs of cards and jokers" .)