What child may want: spin around Britain's capital in hurry (5,4)
I believe the answer is:
teddy bear
'what child may want' is the definition.
'spin around britain's capital in hurry' is the wordplay.
'spin around' becomes 'eddy'.
'capital' indicates taking the first letters.
'in' means one lot of letters goes inside another.
'hurry' becomes 'tear' (tear is a kind of hurry**).
The initial letter of 'britains' is 'b'.
'eddy'+'b'='eddyb'
'eddyb' inserted into 'tear' is 'TEDDY BEAR'.
(Other definitions for teddy bear that I've seen before include "Popular cuddly toy" , "Maybe Winnie" , "Cuddly ursine" , "Soft toy" , "Fetishistic toy" .)