A soldier, say, filling new crate easily (2,1,6)

'easily' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'a soldier say filling new crate' is the wordplay.
'soldier say' becomes 'ant' (soldier is a type of ant).
'filling' means one lot of letters goes inside another.
'new' indicates anagramming the letters.
'crate' with letters rearranged gives 'tacer'.
'ant' put into 'tacer' is 'tacanter'.
'a'+'tacanter'='AT A CANTER'

Can you help me to learn more?