Game in which Cucurella’s header has Gunners in hell? (8)
I believe the answer is:
charades
'game' is the definition.
(I know that charades is a type of guessing game)
'cucurella's header has gunners in hell?' is the wordplay.
'header' says to take the initial letters (in a down clue, the letter at the top of the word).
'has' says to put letters next to each other.
'gunners' becomes 'RA' (Royal Artillery).
'in' means one lot of letters goes inside another.
'hell?' becomes 'hades' ('Hades' can be a synonym of 'hell').
The first letter of 'cucurella' is 'c'.
'ra' placed into 'hades' is 'harades'.
'c'+'harades'='CHARADES'
'in which' is the link.
(Other definitions for charades that I've seen before include "Party guessing game" , "Games like this" , "Miming parlour game" , "Game in which answers are acted out" , "Miming games" .)