Wild wiseacre outside V&A (6)

I believe the answer is:

savage

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'wild' is the definition.
(synonyms)

'wiseacre outside va' is the wordplay.
'wiseacre' becomes 'sage' (I can't explain this - if you can you should give a lot more credence to this answer).
'outside' indicates putting letters inside.
'sage' placed around 'va' is 'SAVAGE'.

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(Other definitions for savage that I've seen before include "Uncivilized" , "Barbarian" , "Barbaric, uncivilised" , "Fierce, violent" , "Brutal" .)

I've seen this clue in The Sun.

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