Musical: Welsh boy mostly taking it in (5)

I believe the answer is:

evita

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

'welsh boy mostly taking it in' is the wordplay.
'welsh boy' becomes 'evan' (common Welsh name).
'mostly' means to remove the last letter.
'taking' becomes 'i' (I can't justify this - if you can you should give a lot more credence to this answer).
'it' becomes 't' (abbreviation. e.g. in 'tis).
'in' indicates putting letters inside.
'evan' with its final letter taken off is 'eva'.
'i'+'t'='it'
'eva' going around 'it' is 'EVITA'.

Can you help me to learn more?

(Other definitions for evita that I've seen before include "1978 Lloyd Webber musical" , "Andrew Lloyd Webber musical set in Argentina" , "Juan Peron's wife" , "1996 musical film, starring Madonna" , "Nineteen Dn musical" .)

I've seen this clue in The Telegraph.

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