Contract to marry little woman includes drivel (7)
I believe the answer is:
betroth
'contract' is the definition.
(I've seen this before)
'woman includes drivel' is the wordplay.
'woman' becomes 'beth' (woman's name).
'includes' indicates putting letters inside.
'drivel' becomes 'rot' (rot is a kind of drivel).
'beth' placed around 'rot' is 'BETROTH'.
'to marry little' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for betroth that I've seen before include "Engage to be married" , "Promise to match" , "Plight" , "Promise to marry" , "contract" .)