The chap who gave Smith new heart (3)

I believe the answer is:

tim

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'the chap' is the definition.

'gave smith new heart' is the wordplay.
'gave smith' becomes 'ti' (I can't justify this - if you can you should give a lot more credence to this answer).
'new' becomes 'ultramodern' (I've seen this before).
'heart' says to take the centre.
The centre of 'ultramodern' is 'm'.
'ti'+'m'='TIM'

'who' is the link.

Can you help me to learn more?

(Other definitions for tim that I've seen before include "Adjoin" , "Tiny Dickens boy from 'A Christmas Carol'" , "Tiny -, Dickens character (A_Christmas Carol)" , "Tiny . . . is a lovable small boy from Dickens" , "Tiny ..., endearing Dickens boy" .)

I've seen this clue in the Evening Standard.

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