You replaced it (4)

I believe the answer is:

thee

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'you' is the definition.
(I've seen this before)

'replaced it' is the wordplay.
'replaced' becomes 'the' (I can't explain this - if you can you should believe this answer much more).
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'the'+'e'='THEE'

Can you help me to learn more?

(Other definitions for thee that I've seen before include "Quaker 'you'" , "'U'" , "You in the olden days" , "You (arch.)" , "Archaic form of 'you'" .)

I've seen this clue in the Evening Standard.

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