Game in scholarly book including piggy back? (7)
I believe the answer is:
twosome
'game' is the definition.
(I have seen 'game of golf' mean 'twosome' so perhaps 'game' could also mean 'twosome')
'scholarly book including piggy back?' is the wordplay.
'scholarly book' becomes 'tome' (I've seen this in another clue).
'including' is an insertion indicator.
'piggy back?' becomes 'wos' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'tome' enclosing 'wos' is 'TWOSOME'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for twosome that I've seen before include "match" , "Couple" , "game of golf" , "Item" , "Pair, duo" .)