A letter to suggest using easy terms (6)

I believe the answer is:

simply

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'using easy terms' is the definition.
I can't tell whether this definition defines the answer.

'a letter to suggest' is the wordplay.
'a letter' becomes 's' ().
'to suggest' becomes 'imply' (implying is a kind of suggesting).
's'+'imply'='SIMPLY'

Can you help me to learn more?

(Other definitions for simply that I've seen before include "In a straightforward manner" , "Without fuss" , "Merely, just" .)

I've seen this clue in the Evening Standard.

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