The solver is leaving this card in leisure centre (5,4)
I believe the answer is:
youth club
'leisure centre' is the definition.
(leisure club for young people)
'the solver is leaving this card' is the wordplay.
'the solver' becomes 'you' (the person solving the crossword).
'leaving' indicates named letters should be taken away.
'card' becomes 'club' (the clubs are a playing card suit).
'this' with 'is' taken out is 'th'.
'you'+'th'+'club'='YOUTH CLUB'
'in' is the link.
(Other definitions for youth club that I've seen before include "teen hangout" , "Somewhere for kids" , "teen spot?" , "Place for young people" , "Place for kids" .)