Big: adjective:
Slash
You could try the word "bulky" which can mean "awkwardly large; big and clumsy".
e, for large, maybe
The first letter of a five letter word meaning big incentive pay received by a salesperson is 'B' for the word bonus.
A canal is a big ditch.
The first letter is L.
crate
large
L is for large.
L for large
l for large
l for large