Couple may see pig turning up in book (7)
I believe the answer is:
twosome
'couple' is the definition.
(synonyms)
'pig turning up in book' is the wordplay.
'pig' becomes 'sow' (I've seen this before).
'turning up' is a reversal indicator.
'in' indicates putting letters inside.
'book' becomes 'tome' (a tome is a book).
'sow' backwards is 'wos'.
'wos' put within 'tome' is 'TWOSOME'.
'may see' is the link.
(Other definitions for twosome that I've seen before include "Item" , "Couple" , "match" , "Pair, duo" , "game of golf" .)