Public show using most of land on playing field (7)
I believe the answer is:
recital
'public show' is the definition.
'recital' can be an answer for 'show' (recital is a kind of show). I am not sure about the 'public' bit.
'most of land on playing field' is the wordplay.
'most of land' becomes 'ital' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' means one lot of letters go next to another.
'playing field' becomes 'rec' (short for recreation ground).
'ital' after 'rec' is 'RECITAL'.
'using' acts as a link.
Can you help me to learn more?
(Other definitions for recital that I've seen before include "Maybe solo musical performance" , "Public musical performance" , "Performance of music by soloist" , "Public performance by a solo musician" , "Chamber music concert" .)