Small child loves snowmobile (6)
I believe the answer is:
skidoo
'snowmobile' is the definition.
(trademark name for a type of snowmobile)
'small child loves' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'child' becomes 'kid' ('kid' can be a synonym of 'child'**).
'loves' becomes 'oo'.
's'+'kid'+'oo'='SKIDOO'
(Other definitions for skidoo that I've seen before include "snowmobile" , "Motorised toboggan - get out fast" , "Motorised sledge" , "Snow vehicle with skis at the front" , "winter vehicle" .)