Working on a big new motorhome (9)

I believe the answer is:

winnebago

I'm a little stuck... Click here to teach me more about this clue!

'motorhome' is the definition.
I can't tell whether this defines the answer.

'working on a big new' is the wordplay.
'working' indicates anagramming the letters.
'on'+'a'+'big'+'new'='onabignew'
'onabignew' with letters rearranged gives 'WINNEBAGO'.

Can you help me to learn more?

(Other definitions for winnebago that I've seen before include "Popular US motor home manufacturer" , "Native American" , "camper van" , "Brave" , "Wino began badly in the motor home" .)

I've seen this clue in The Times and The Sunday Times.

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