Fancy one with wealth comprising silver (7)

I believe the answer is:

imagine

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'fancy' is the definition.
(I know that fancy is a kind of imagine)

'one with wealth comprising silver' is the wordplay.
'one' becomes 'i' (Roman numeral).
'with' says to put letters next to each other.
'wealth' becomes 'mine' (I can't justify this - if you can you should give a lot more credence to this answer).
'comprising' indicates putting letters inside.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'mine' enclosing 'ag' is 'magine'.
'i'+'magine'='IMAGINE'

Can you help me to learn more?

(Other definitions for imagine that I've seen before include "1971 John Lennon song" , "Suppose; conceive" , "Picture in mind, envisage" , "Assume" , "that Lennon composed" .)

I've seen this clue in The Telegraph.

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